Luis Rojas-Solórzano

Luis Rojas-Solórzano
Simon Bolívar University · Departamento de Conversión y Transporte de Energía

B.M.E., M.Sc., Ph.D.
CFD and Clean Energy Technologies

About

165
Publications
85,926
Reads
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476
Citations
Citations since 2017
65 Research Items
408 Citations
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2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Introduction
Experienced professional, well-versed in Higher Education Management with ample theoretical and practical exposure to Thermofluid Sciences, CFD, and Clean Energy Technologies. Successful career in the engineering higher education system as Tenured Full Professor (2004-, USB), Head of Mech. Eng. program (2007-2010), Head of Energy Conversion and Fluid Mechanics labs (1991-92, 1997-2002), and Senior Industry Leading Consultant at USB-Venezuela. Website: https://ve.linkedin.com/in/luisrojassolorzan
Additional affiliations
August 2018 - present
Nazarbayev University
Position
  • Managing Director
Description
  • Student-centered Educator, nurturing a vision of academic success and promoting instructional excellence. Ample experience in Thermofluid Sciences, CFD and Clean Energy Technologies. Website: https://www.linkedin.com/in/luisrojassolorzano/
August 2013 - August 2018
Nazarbayev University
Position
  • Professor (Associate)
Description
  • Teaching/Advising/Consulting on: Advanced Fluid Dynamics CFD Energetic Systems Biomedical Engineering (CFD) Clean Energy Technologies CAD-CAE Optimization Turbulent Flow Transport
April 2013 - present
Pontifical Catholic University of Peru
Position
  • Invited Professor
Description
  • Invited Professor to teach Master Students courses on Energy Systems/CFD, and advise some of their theses.
Education
August 1992 - August 1997
Carnegie Mellon University
Field of study
  • Mechanical Engineering
September 1988 - March 1991
Simon Bolívar University
Field of study
  • Hydraulics Engineering
September 1980 - March 1985
Simon Bolívar University
Field of study
  • Mechanical Engineering

Publications

Publications (165)
Article
In this work, we have incorporated a crossover equation of state into the pseudopotential multiphase Lattice Boltzmann model (LBM) to improve the prediction of thermodynamic properties of fluids and their flow in near-critical and supercritical regions. Modeling carbon dioxide (CO2) properties in these regions is of increasing interest for industri...
Article
The circular economy concept resonates as a new approach to optimize limited resource usage and reduce waste generation. However, most solar PV power plant analyses do not consider the sustainable disposal of used systems at the End of Life (EoL) or at the time for potential refurbishment. The 50 MWp Burnoye‐1 solar power plant in the Jambyl region...
Article
Full-text available
This work presents the numerical modeling of a droplet’s sessile and dynamic behavior on a grooved surface. A droplet is placed on horizontal and vertical sliding conditions to observe its behavior under wettable and non-wettable conditions. The numerical analysis uses the multicomponent multiphase Shan-Chen Lattice Boltzmann Model (SC-LBM). The Ca...
Article
Full-text available
This report summarizes our recent implementation of a crossover formulation in the lattice Boltzmann method and its application in modeling transcritical CO2 sequestration in water-saturated porous media. A crossover enhancement of the Peng-Robinson equation of state increases the accuracy in predicting fluid properties in transcritical conditions,...
Article
Drinking water scarcity is becoming an urgent problem worldwide, and it affects developing and developed countries alike. Kazakhstan is not an exception and has its primary sources of drinking water (groundwater, rivers, and lakes) continuously depleted and polluted; moreover, the country will be close to its exploitation limits within the followin...
Article
Full-text available
In the context of the global energy transition, governments design and apply renewable energy policies as tools to replace fossil fuel sources for the heating end-use sector, which represents half of the global total final energy consumption (TFEC). In the last two decades, large deployments of solar thermal technologies, such as solar water heater...
Article
Full-text available
The original Shan-Chen’s pseudopotential Lattice Boltzmann Model (LBM) has continuously evolved during the past two decades. However, despite its capability to simulate multiphase flows, the model still faces challenges when applied to multicomponent-multiphase flows in complex geometries with a moderately high-density ratio. Furthermore, classical...
Article
The use of phase-changing materials (PCM) in residential envelopes is an emerging technology that promises significant cooling and heating energy savings. Such energy savings are expected due to PCM's inherent energy storage capability, realized as physical transformation processes, during hot-cold weather transitions. However, this technology has...
Article
Full-text available
The drug development process can greatly benefit from liver-on-a-chip platforms aiming to recapitulate the physiology, mechanisms, and functionalities of liver cells in an in vitro environment. The liver is the most important organ in drug metabolism investigation. Here, we report the development of a hybrid cyclic olefin copolymer (COC) and polydi...
Article
Full-text available
Currently, the high natural oil content in the regular daily diet of a significant segment of the global population has raised deep concern for health authorities worldwide. One example can be soups, which are liquid foods that usually contain high salt levels besides the fat released by the ingredients during the cooking process and the oil that i...
Article
Full-text available
The numerical investigation of the interpenetrating flow dynamics of a gas injected into a ho-mogeneous porous media saturated with liquid is presented. The analysis is undertaken as a function of the inlet velocity, liquid–gas viscosity ratio (D) and physical properties of the porous medium, such as porous geometry and surface wettability. The stu...
Article
Global warming is affecting the Earth's surface temperature and consequently the intensity of near‐surface airstreams and wind power potential in many regions. Conversely, global wind power installed capacity is continuously growing during the last years. The economic viability and sustainability of centralized wind projects relies heavily on wind...
Article
Full-text available
This paper presents the techno-economic feasibility analysis of an on-grid Photovoltaic Solar System (PVSS) subject to Mediterranean climate aging effects. The PVSS under study is considered installed on the roof of Shymkent airport, located in southern Kazakhstan. A PVSS performance degradation rate of 1.48%-per-annun was considered according to t...
Article
This work presents the numerical modeling of a sliding droplet on a vertical smooth wall under hydrophobic and hydrophilic conditions using the multiphase Shan-Chen Lattice Boltzmann Model (SC-LBM). The gravitational action above the interfacial force was introduced through the variation of the Bond number and contact angle between droplet, solid s...
Conference Paper
Understanding the morphology of transformation of a single bubble immersed in a liquid undergoing a shear flow is essential in predicting bubble deformation and breakup phenomena commonly found in applications involving complex liquid-gas multiphase flow. In this study, the deformation and breakup of a single bubble released in a fully developed la...
Article
Full-text available
Multiphase flows are present in many natural phenomena, processing technologies, and industries. In the petroleum industry, the multiphase flow is highly relevant, and special attention is paid to the development of predictive tools that determine flow conditions to guarantee safe and economic hydrocarbon extraction and transportation. Hydrodynamic...
Article
Full-text available
Efficient illumination of classrooms is one of many technologies that can help in constructing a cleaner future and have a positive environmental impact. However, the long-term economic plan of their implementation must still be created and validated. One promising technology is light-emitting diodes (LEDs) that have a low carbon footprint compared...
Article
Water heating represents a large fraction of energy consumption in the residential sector, and it has significant health, economic, and environmental implications. However, it is well known that temperatures between 20 °C and 42 °C promote the multiplication of Legionella species, which are the causative agent of the Legionnaires' disease, a life-t...
Preprint
Full-text available
This paper presents the techno-economic feasibility analysis of an on-grid Photovoltaic Solar System (PVSS) subject to Mediterranean climate aging effects. The PVSS under study is considered installed on the roof of Shymkent airport, located in southern Kazakhstan. A PVSS performance degradation rate of 1.48%-per-annun was considered according to t...
Article
Kazakhstan is currently committed to develop its renewable energy resources. In 2012, the government introduced a low-carbon energy strategy to reduce the production of air pollutants, including anthropogenic CO2e, and to increase the share of clean energy up to 50% of total consumption by 2050. As a contribution to this strategy, this paper presen...
Conference Paper
The contact angle is a measurement of wettability of a solid surface resulting from molecular attraction or repulsion at the encounter point between a liquid-gas interface and a wall. To date, the determination of the contact angle is commonly performed experimentally with very limited numerical modelling, due to the complex nature of the intermole...
Conference Paper
In recent years, a large effort has been devoted to the study of the viscous fingering phenomenon in microchannel flows. This phenomenon plays a crucial role in many fields of industry and occurs in geological sequestration of carbon dioxide (CO2), in the secondary and tertiary oil recovery stages. Viscous fingering, also known as the Saffman-Taylo...
Article
Green energy technologies in combination with conventional technologies can result in viable solutions in many applications within the fundamental areas of the economy, including the transportation segment. This sector has recently experienced rapid development in Nur-Sultan, capital of the Republic of Kazakhstan and one of the popular projects in...
Article
Growth of the global population is directly associated with the increase in energy consumption. This pattern can be predominantly seen in emerging economies. However, coping with economic growth while pledging to combat global warming is not a dilemma in the Republic of Kazakhstan, which launched in 2012 a strategy plan determined to have a 50% of...
Preprint
Solar water heating (SWH) is a solar energy harvesting technology that transforms direct solar irradiation into water heating for residential or industrial purposes in most cases. Solar Water Heating displaces traditional heating sources such as coal or gas. Overall, residential heating demand is up to 13.1 PWh worldwide (Ürge-Vorsatz, et al., 2015...
Article
The Philippines is an emerging solar photovoltaic (PV) market, installing ~1 GW in the span of last 2 years. This growth was enabled by the enactment of supporting policies: feed-in-tariff (FIT) and net-metering (NM), despite increasing criticism on the latter. This study addresses the terms, conditions and effectiveness of these policies reflected...
Conference Paper
Multiphase flow is commonly found in almost every process related to oil and gas industry. The precise prediction of the flow behavior is essential to provide safe and efficient hydrocarbon recovery. An accurate characterization of multiphase flow plays a major role in well design optimization and development of successful production and transporta...
Article
Full-text available
Renewable energy in Kazakhstan rises in the shadow of fossil fuels - Volume 43 Issue 9 - Eva Karatairi, Luis R. Rojas-Solórzano, Aiymgul Kerimray
Conference Paper
India is one of the highest GHG emitters in the world. Building energy efficiency measures can go a long way in contributing to reducing this emission. With lighting being a major contributor to commercial building energy consumption, improvements in this sector can be an effective way to bring energy savings and reduce GHG emissions. This paper st...
Chapter
Solar power has significant potential to reduce reliance on conventional energy sources in South Africa. A prefeasibility study for a communal solar water heating system (SWHS) is performed for an apartment building in the Cape Town area. Energetic-economic modeling of the system is performed by calculating the solar fraction and fundamental indica...
Chapter
In the family of renewable technologies, photovoltaic (PV) systems today attract considerable attention (Dornfeldt, M.: The future of the Kazakh energy sector and the Kazakhstan 2050 strategy. Retrieved November 2, 2014, from 18th REFORM Group Meeting http://www.polsoz.fu-berlin.de/polwiss/forschung/systeme/ffu/veranstaltungen/termine/downloads/13_...
Chapter
The industry sector is facing many challenges such as global competition, energy pricing, environmental impact among others. Consequently, the necessity of energy efficiency measures has become evident, framing the objective of this project as to assess the technical and economic prefeasibility of implementing energy efficiency measures in a dairy...
Chapter
The technical and economic feasibility of the installation of a mini-hydroelectric power plant on El Valle River in Venezuela is assessed. Special attention is paid to modeling Venezuela’s energy and economic scenarios. Sensitivity, risk, and emission analyses are also carried out. The results of the study show very attractive economic indicators,...
Chapter
Clean energy technologies are beginning to receive attention in Nigeria to offset increasing greenhouse gas (GHG) emissions. These emissions are associated to the wide use of small-scale fossil fuel-powered generators by about 55% of its 180 million people, yet to be connected to the grid. While a large hydropower potential exists in Nigeria, even...
Chapter
The energy efficiency impact of replacing fluorescent lamps with light-emitting diode (LED) and electric water heaters with solar thermal systems in two municipal buildings in Ekurhuleni, South Africa, is examined, including effects of current policies. The analysis shows that switching from fluorescent to LEDs achieves 37.3% energy savings and 41....
Chapter
In this investigation, a feasibility study of installing PV panels on the rooftop of School of Engineering at NU is carried out. A 24 kWp rooftop PV installation with a 14.7% capacity factor, capable to export 31 MWh of electricity to the grid per year, is analyzed. Three scenarios or policy options are presented. The scenarios corresponded to havi...
Chapter
The technical and economic challenges associated with using solar thermal systems for heating water in large-scale aquaculture applications in a cold climate country are addressed in this paper. Policies of using solar thermal heating for large aquaculture farms and corresponding reduction of CO2 emissions are presented for a case study in Finland....
Chapter
The techno-economic assessment of solar water heating (SWH) systems in the city of Astana, Kazakhstan, is presented. Active indirect solar collectors designed and manufactured by a local developer were considered in the analysis. This work makes evident that, despite the perception that unsubsidized solar technology is not cost-effective yet, imple...
Chapter
As a vast Northern nation, Canada faces unique challenges in addressing climate change. Indeed, almost 63% of total energy consumption in Canada is due to space heating. This investigation compares two energy efficiency options for an existent eight-apartment building located in the region of Nova Scotia. The first option (Option 1) corresponds to...
Article
The study of highly viscous multiphase flow systems is of fundamental interest in the oil industry. Most of the Venezuelan oil fields produce heavy oil with other production fluids, such as water and gas, and sand particles flowing from the reservoir to the surface facilities. A fraction of these phases flows fully separated, while another one flow...
Article
Problems with unsustainable use of energy by households and lack of access to energy infrastructure require effective actions from the policy makers. Energy system models can usefully analyze future residential sector energy pathways “within” the full energy system. However, few energy system models have been developed with disaggregated sub-nation...
Chapter
Under the Paris Agreement, Kazakhstan’s nationally determined contribution (NDC) target is to reduce its greenhouse gas emissions (GHG) by between 15 and 25% by 2030 compared with 1990 levels. Kazakhstan’s energy system is highly carbon intensive and GHG emissions continue to steadily grow, indicating insufficient progress towards achieving the NDC...
Preprint
Full-text available
A multicomponent Lattice Boltzmann Method (LBM) scheme is employed to study the performance of a T-shaped micromixer with obstacles in its main channel. This solution was proposed in order to speed-up the diffusive mixing process which occurs at very low-Reynolds flow regime. The multicomponent LBM was firstly validated against well-documented case...
Article
A multicomponent Lattice Boltzmann Method (LBM) scheme is employed to study the performance of a T-shaped micromixer with obstacles in its main channel. This solution was proposed in order to speed-up the diffusive mixing process which occurs at very low-Reynolds flow regime. The multicomponent LBM was firstly validated against well-documented cases...
Article
Full-text available
Kazakhstan is an upper-middle-income country and one of the coldest countries in the world with rich energy resources and energy prices considerably lower than in developed countries. This paper presents the first comprehensive overview of household fuel use in Kazakhstan and assesses the causes and extent of energy poverty using the Households Liv...
Conference Paper
Cardiovascular Diseases, the common name for various Heart Diseases, are responsible for nearly 17.3 million deaths annually and remain the leading global cause of death in the world. It is estimated that this number will grow to more than 23.6 million by 2030, with almost 80% of all cases taking place in low and middle income countries. Surgical t...
Conference Paper
The complete understanding of the aerodynamics of wings and blades under transonic conditions represents a substantial challenge in the design of modern airplanes and turbomachinery. Transonic flow over airfoils may result in appearance of shock waves, which lead to increase in drag if not properly considered during the design stage. Therefore, it...
Article
Full-text available
Tuberculosis (TB) remains one of the main causes of human death around the globe. The mortality rate for patients infected with active TB goes beyond 50% when not diagnosed. Rapid and accurate diagnostics coupled with further prompt treatment of the disease is the cornerstone for controlling TB outbreaks. To reduce this burden, the existing gap bet...
Article
Residential coal consumption has decreased significantly since 1990 in most developed and developing countries, due to fuel switching. However, there are still countries with a high proportion of households using coal for heating purposes, in some cases with increasing coal consumption trends. This review discusses the patterns of the coal use, ass...
Article
Full-text available
Airplanes regularly operate switching between various flight modes such as take-off, climb, cruise, descend and landing. During these flight conditions the free-stream approaching the wings undergo fundamental changes. In transonic flow conditions, typically in the military or aerospace applications, existence of nonlinear and unsteady effects of t...
Article
Full-text available
In the present study, high data rate measurements were obtained for the streamwise and vertical velocity components using 2D Laser Doppler Velocimeter. The turbulent field in a straight compound-channel flow was characterized for three different uniform flow water depths, corresponding to “deep flows”, “intermediate flows” and “shallow flows” condi...
Presentation
Full-text available
1. World Energy Demand and Challenges. 2. Clean Energy Technologies. 3. Introduction to RETScreen® software. 4. Wind Energy Project Analysis. Case Study: Wind Farm in Andhra Pradesh, India. 5. Risk and Sensitivity Analysis. 6. Q & A’s.
Article
Full-text available
This paper aims to develop appropriate boundary conditions to be used in the numerical analysis (CFD) of smoke transport within a semi-enclosed space resembling a typical road tunnel. The study considers the following stages: (a) Model set up: the geometry of an existing tunnel, with available experimental data to validate numerical results, is rec...
Article
Full-text available
This paper presents a study of the motion of a deformable droplet modelled using the Shan-Chen (SC) Multiphase Lattice Boltzmann Model (LBM). Firstly, a 2D static droplet in a periodic domain is modelled such that its surface tension is numerically determined and successfully validated against Young-Laplace equation. Next, simulation of a 2D drople...
Article
Full-text available
Liquid-solid flows, in both heterogeneous and saltation regimes, are critical in the transport of suspended solid particles in pipelines prone to particles settling and accumulating on the bottom of the pipe, eventually blocking the flow and risking flow assurance. Numerical simulation of a statistically developed and steady twophase liquid-solid f...
Article
Full-text available
The effect of a surfactant on wettability alteration and emulsion inversion is studied using Dissipative Particle Dynamics (DPD) modeling. The DPD model contains 1200 oil molecules, 4800 water molecules, 400 oil soluble (indigenous to the oil) surfactants with a head-tail configuration and 400 water soluble molecules to mimic a surface active chemi...
Conference Paper
The technical and economic challenges associated with using solar thermal systems for heating water in large-scale aquaculture applications in a cold climate country are addressed in this paper. Policies of using solar thermal heating for large aquaculture farms and the corresponding potential benefits to counteract global challenges, such as reduc...
Conference Paper
The universities around the world are taking every day a more decisive role in fighting global warming. Indeed, many campuses are not only teaching established and disrupting clean energy technologies, but also are practicing their lectures. For example, the University of Arizona, USA, leads the campuses with 28 MW of installed On-Grid PV systems (...
Conference Paper
This paper examines the energy efficiency impact of replacing fluorescent lamps with light emitting diode (LED), and electric water heaters with solar thermal systems in two municipal buildings in Ekurhuleni, South Africa. A retrofitting project with LEDs and solar water heaters offers the opportunity to increase energy efficiency and lower electri...
Conference Paper
Current centralized heating system of Astana city, capital of Kazakhstan, is not able to satisfy the fast growing energy consumption rate of its population. There are homes that are not connected to the central heating system yet and use autonomous heating systems instead. Most decentralized households use electric water heaters and coal as fuel fo...
Conference Paper
Regions located near the mid-latitude between the tropics and the earth poles are known as mid-temperate regions. These regions rather than having extreme climate, enjoy relatively mild temperatures with moderate changes between summer and winter. However, winter in mid-temperate countries range from mild to cool, requiring still special attention...
Conference Paper
There is a significant potential for energy efficiency improvements in the residential buildings in Kazakhstan. The analysis of energy audits confirmed this statement: heat transfer coefficient of walls is much higher than in European countries with similar climates. In consequence, households consumption of energy in Kazakhstan per square meter of...
Conference Paper
This paper presents the assessment of the capability of Shan-Chen (SC) Multiphase Lattice Boltzmann Model (LBM) to accurately predict the liquid-gas interface in multiphase flow. Multiphase flow can be found in various applications, as for example, in CO2 sequestration. One of the challenges for numerical models of such multiphase flows is being ab...
Conference Paper
This paper assesses the technical, economic and environmental impact for the implementation of a small-scale anaerobic digestion system in an animal farm located in the Republic of Kazakhstan. All data for manure availability and local energy consumption was obtained from the model farm “Buranbayev Company” which is located in Uralsk, Kazakhstan. A...
Conference Paper
This paper addresses the viability analysis of using a ground-source heat pump (GSHP) system to supply part of the cooling requirements in an office building located in a city with temperate climate.The analysis includes the technical and economic feasibility, as well as the greenhouse gases emission reduction achieved by implementing this technolo...
Conference Paper
This article aims to determine technical-economic viability of on-grid PV market for residential houses in Mangystau region, located in southwest of Kazakhstan. This region of the country was chosen for its favourable location and generous annual insolation. The study considered PV system modules made of local high quality silicon manufactured by «...
Conference Paper
This paper presents the assessment of four energy efficiency measures in a touristic building located in Mazatlan, State of Sinaloa, Mexico. The viability study is conducted through technical and life cycle cost analysis, complemented with impact on greenhouse gas emissions reduction when energy efficiency measures are implemented on: lighting, pum...
Conference Paper
Full-text available
Hydraulic performance and thermal characterization are the main parameters dictating proper consideration of flow assurance in pipelines. Hydraulic performance considers the evaluation of multiphase systems, specifically the equilibrium of phases and consequent flow patterns and their impact on pressure loss, holdup and sustainable and safe flow tr...
Conference Paper
Full-text available
Lack of access to modern fuels, high fuel prices, poor building insulation, and income poverty are some of the aspects leading to the energy poverty problem. Kazakhstan may be particularly highly affected by this phenomenon due to the high heating demand and severe continental climate, as well as due to the high use of coal and biomass in some of i...
Article
Full-text available
Abdominal aortic aneurysm (AAA) is a dilation of the abdominal aorta (above 50 % of its original diameter), which can cause death upon rupturing. It usually grows asymptomatically leading to late clinical intervention. The medical criteria to indicate surgery are based on measuring the diameter and growth rate, but in many cases aneurysms fail at u...
Article
Full-text available
Nowadays, a Ventricular Assist Device (VAD) is a hope of clinic solution to patients with heart failure. This study presents the design of the “trumpet mouth” ventricular cannula (TMVC) connected to a pediatric VAD, optimized to reduce the conditions that generate blood damage. The flow through the TMVC is analysed using Computational Fluid Dynamic...
Article
Full-text available
The aim of this paper is to consider one of the most traffic-loaded regions of Astana city (Kazakhstan) and to determine the concentration of carbon-monoxide (CO) in the air during the peak hours. CFD analysis based on the SolidWorks-EFD platform was used to simulate the dispersion of contaminants given the estimated emission rates and weather cond...