Boris V Balakin

Boris V Balakin
Høgskulen på Vestlandet | HVL · Mechanical and Marine Engineering

Eng.Phys., PhD

About

81
Publications
15,691
Reads
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823
Citations
Introduction
nanofluids heat transfer thermal physics solar collectors concentrated solar power multiphase flow computational fluid dynamics gas hydrates hemodynamics nasal aerodynamics positron emission particle tracking agglomeration in multiphase flows
Additional affiliations
March 2018 - March 2019
Høgskulen på Vestlandet
Position
  • Professor
December 2016 - present
National Research Nuclear University MEPhI
Position
  • Professor
December 2013 - present
Høgskulen på Vestlandet
Position
  • Professor (Full)
Description
  • - pragmatic CFD-modelling of industrial systems - DEM studies of agglomeration in multiphase flows - positron emission particle tracking - boiling in nano-fluids - hemodynamics
Education
September 2014 - January 2015
University of Bergen
Field of study
  • University program in pedagogics
September 2007 - June 2010
University of Bergen
Field of study
  • multiphase CFD
September 2000 - March 2006
National Research Nuclear University MEPhI
Field of study
  • Thermo-hydraulics of nuclear reactors and power plants

Publications

Publications (81)
Article
Nanofluid-based direct absorption of solar heat results in thermal efficiencies superior to conventional solar thermal technology. In addition, convection of nanofluid can be sustained pump-free in the collector. In this article, we study an aqueous magnetic nanofluid capable to establish the photothermal convection in a lab-scale direct absorption...
Article
The demand for efficient and sustainable energy is continuously increasing. Among the many technologies with great potential within this field are nanofluids. Nevertheless, there is still a considerable lack of information regarding their erosive effects on systems materials. In this research, the tribological behaviour of aqueous 1.33 wt% TiO2 nan...
Article
Full-text available
The paper is devoted to the topic of direct absorption solar collectors (DASCs). Various kinds of fluids can be used as heat transfer fluid in DASCs, and the main focus of our paper is on comparing nanofluids (water with carbon black nanoparticles, concentrations between 0.25 and 1.00% weight) and biodegradable coffee colloids. At first, these flui...
Article
In this research, we conducted water electrolysis experiments of a carbon black (CB) based sodium sulfate electrolyte using a Hoffman voltameter. The main objective was to investigate hydrogen production in such systems, as well as analyse the electrical properties and thermal properties of nanofluids. A halogen lamp, mimicking solar energy, was us...
Article
Direct absorption solar collectors (DASC) with nanofluid represent a new direction in solar thermal technology that is simpler yet more efficient than conventional equipment. In this work, we report details of performance for a custom tubular DASC with a carbon-based nanofluid. The collector was tested experimentally following a standard procedure...
Preprint
Full-text available
The paper is devoted to the topic of direct absorption solar collectors (DASCs). The main focus is on comparing two kinds of working fluids that can be used in DASCs, namely carbon black nanofluids and biodegradable coffee colloids. At first, the fluids were tested by exposing them to artificial light (indoor experiments) and real solar irradiation...
Article
Due to the high light absorption and the possibility of localizing boiling to the interior of the receiver, nanoparticles are promising for solar-driven desalination. The paper presents an experimental study of the nanoparticle-based photothermal boiling of water with sea salt. The experiments were carried out using a laboratory-scale system with a...
Chapter
The non-availability of freshwater is one of the major problems faced by humanity. Major developments in water purification technologies are needed in the current scenario at an affordable price. Different types of treatment processes are available to supply freshwater to rural and urban areas at large and small scales. However, conventional fossil...
Article
Full-text available
A significant part of energy consumption in Northern countries goes to heating. There is no consensus about the most efficient source of renewable heat there. This paper presents a field study for a 7.8 m2 vacuum tube solar collector facility that is conservatively located in the cloudy and cold climate conditions of western Norway. We analyse a ye...
Article
The conversion of solar energy to heat can be performed in direct absorption solar collectors, where the radiation from the sun is absorbed by a fluid. There are various types of fluids that can be used, and recently, nanofluids (i.e., liquids with immersed nanoparticles) have been investigated by researchers. Nevertheless, nanofluids have inherent...
Article
Full-text available
Water droplets released from the sea surface represent one of the major causes of ice accretion on marine vessels. A one-dimensional model of the freezing of a spherical water droplet moving in cold air was developed. The crystallization model allows one to obtain an analytical solution if a uniform temperature distribution over the liquid’s core i...
Article
The paper describes the effect of sodium dodecyl sulfate (SDS) on the steam generation during photothermal boiling of carbon nanofluids. The considered process finds promising applications for e.g. solar desalination where SDS may boost steam generation. Our study was carried out in a lab system boiling aqueous suspensions of carbon by means of art...
Article
Molten salts-based nanofluids have been widely considered for Thermal Energy Storage (TES) applications due to their enhanced thermophysical properties. However, the application of such fluids faces many challenges, among which are the correct determination of their properties, stability, compatibility with construction materials and the overall en...
Article
Full-text available
Deviant geometry of nasal channels results in significant changes to nasal aerodynamics that alter flow resistance, sensation, and the ability to filter aerosols. The invasive, operative modification of nasal geometry might alter the intranasal flow patterns, and this must be considered in advance at the stage of surgical planning. The present work...
Article
Full-text available
Future district heating systems need to be more flexible and move towards a carbon-neutral generation. Compression heat pumps are foreseen to be promising future tools for district heating systems in EU countries. The paper presents the simulation data or a vertical double-pipe geothermal heat exchanger with ethylene glycol-Al 2 O 3 as a working fl...
Article
Full-text available
To study the flow of objects in opaque flow processes, the PEPT (positron emission particle tracking) technique may be utilized. The PEPT technique is based on the same principle of positron emission tomography (PET). Both techniques detect the characteristic back-to-back gamma pairs caused by positron-electron annihilation. PEPT allows tracking of...
Article
Photo-thermal evaporation of nanofluids has potential applications in solar desalination, micro-CHP (combined heat and power) and domestic off-grid disinfection. In this research, we reproduced the process experimentally using 110-nm iron oxide particles dispersed in water. At an initial lab-scale stage, under the artificial radiation of 6.9 suns,...
Article
Discrete element methods require appropriate models for particle-particle collisions. Usually, researchers use soft-sphere types of models where the collision dynamics is solved numerically. This makes the simulation computationally expensive. In this paper, however, we show a hard-sphere model that uses ready analytic formulas that relate the pre-...
Article
The direct photothermal boiling in suspensions of nano- and microscopic particles finds multiple applications in concentrated solar power: turbine-based combined heat and power (CHP) generation, solar distillation, energy storage, and chemical synthesis. However, the most promising application is solar desalination. There have been multiple studies...
Article
Full-text available
Solar energy is the most promising source of renewable energy. However, the solar energy harvesting process has relatively low efficiency, while the practical use of solar energy is challenging. Direct absorption solar collectors (DASC) have been proved to be effective for a variety of applications. In this article, a numerical study of a nanofluid...
Article
The present paper focuses on the issue of erosion due to fluid flow laden with nano- and microparticles. We investigated the case of a pipe elbow using theoretical analysis and numerical simulations. For the case when the particles were large, that is, of micrometre size, we observed the expected behaviour in which the erosion rate was greater with...
Article
Solar steam generation, as a high efficiency photo-thermal conversion method, has enormous potential for many industrial applications. In this work, a reduced graphene oxide (rGO) composite membrane with high light absorption was prepared to enhance the steam generation of water successfully. Through different experimental tests, the evaporation ra...
Article
The paper presents the results of experimental and theoretical studies of temperature fluctuations at the surface of heaters in different heat transfer regimes. Developing several methods of treatment for the temperature fluctuations, we succeed in the diagnosing the onset of transient boiling regimes. The proposed methods are based on the statisti...
Conference Paper
Full-text available
In this research photothermal energy conversion in nanofluids was numerically studied using a CFD model. A Direct Absorption Collector (DAC) of cylindrical shape with incident light on one of its surfaces was adopted for the simulations. The Eulerian two-phase transient model included the volumetric absorption of light, losses to the surroundings a...
Conference Paper
Photothermal boiling in nanofluids is an energy-efficient process finding multiple promising applications in medicine, space technology, laser printing and nuclear engineering. The most important field is though solar energy where the nanoparticle-driven boiling of the base fluid drives a nano-turbine or a distillator. Hundreds of experimental and...
Conference Paper
Hydraulic accumulators are widely used in petroleum industry. There is however an important gap in our understanding of the dynamics of their discharge, especially in unsteady environmental conditions. In this research a hydraulic accumulator has been tested theoretically, numerically and experimentally. An analytical solution has been developed an...
Article
Direct absorption collectors (DAC) with nanofluid are among the most promising yet least studied in solar energy technology. There are numerous micro- and macroscopic factors that determine their efficiency. This complicates in situ optimization of DACs using physical prototypes. The present paper describes a multiphase CFD model of the collector,...
Article
Full-text available
Formation of gas hydrates in systems with high water content is one of the major challenges facing the petroleum industry today. Conventional mitigation using thermodynamic inhibitors is expensive due to large water volumes, while the most recent flow management strategies (anti-agglomerants, cold flow, etc.) have not yet been adopted because the d...
Article
Full-text available
Flows of fluids laden with small particles in pipes are common in industry. An interesting and still unexplored issue is erosion of walls due to impact of particles. The main focus of our research was on nanoparticles. This type of particles have recently been tested as e.g. potential components of coolants. In this paper, attention was paid to ero...
Article
Full-text available
This contribution describes a multiphase CFD model, capable of simulating convective mass and heat transfer in a ferrofluid. The model was used for a parametric analysis of thermomagnetic convection, demonstrating 1.3-fold enhancement of thermal efficiency under the influence of an external magnetic field. The model was validated against two differ...
Article
The dynamics of dust lifting behind a passing shock wave has been extensively studied in recent years. Nevertheless, only a few studies have focused on the problem of dust lifting by a rarefaction wave. Therefore, the first objective of this research was to create a three-dimensional computational fluid dynamics (CFD) model of experiments and simul...
Article
Full-text available
The process of photothermal evaporation in nanofluids finds promising applications in solar energetics, medicine and process technology. Previous studies report highly efficient production of solar steam in fluids with gold nanoparticles. In this article, we establish the process in nanofluids with less expensive carbon black (CB) and iron oxide (I...
Article
Full-text available
Multiphase flow meters are widely used in nuclear, petroleum and chemical industries. Here the flow rate is defined indirectly by the differential pressure measurement over the device. An additional measurement is required to estimate average density of the phase mixture. This could be done by means of the gamma-ray, electromagnetic or acoustic tom...
Article
Full-text available
Determination of forthcoming boiling regime is one of the challenging problems in diagnostics of industrial systems where rapid thermal transients exist. Taking into account intensive temperature oscillations met there, a conventional, boiling-curve based forecast becomes inaccurate. In the present paper we demonstrate the technique to cope tempera...
Article
The potential outcome of a surgical enlargement of internal nasal channels may be a complication of nasal breathing termed the Empty Nose Syndrome (ENS). ENS pathophysiology is not entirely understood because the expansion of air pathways would in theory ease inhalation. The present contribution is aimed at defining the biophysical markers responsi...
Article
Boiling of cryogenic fluids is an important problem in superconductor technology, which becomes emergent in case an accidental, short-term and unsteady heating impulse appears. Here the process deviates from a standard scenario, approaching the crisis at lower heating. The present paper sheds light into the matter, aiming at the theoretical determi...
Conference Paper
Dust explosions take place when small particles of flammable material such as grain, wood, plastic, coal and metal are dispersed in air and ignited. An important research tool that is used for describing dust explosion characteristics is the Hartmann apparatus, where dust is dispersed by a pressure wave. This makes it possible to find e.g. the mini...
Conference Paper
Industrial multiphase flow measurement systems often contain meters based on Venturi principle. Those instruments deal with the differential pressure measurements whose accurate interpretation is possible when the flow morphology is known a-priori. The present paper reports the results of CFD-modelling of a gas-liquid flow through a vertical nozzle...
Article
Full-text available
Positron emission particle tracking (PEPT) is a novel experimental technique for non-invasive inspection of industrial fluid/particle flows. The method is based on the dynamic positioning of a positron-emitting, flowing object (particle) performed through the sensing of annihilation events and subsequent numerical treatment to determine the particl...
Article
Hydrates of light hydrocarbons are frequently formed during the subsea petroleum production. These crystalline ice-like solids may accumulate at concentrations sensitive from the flow assurance point of view, increasing the overall pumping costs and imposing sufficient risk of the pipe blockage. Modern trend in the assessment of hydrate-related ris...
Conference Paper
Full-text available
Turbulent flows laden with multiple reacting phases are common in, for instance, petroleum industry. The inter-phase reactions often result in formation of adhesive solid inclusions, which may lead to pipe plugging due to agglomeration and deposition of solids. The modern efforts to overcome the problem focus on prevention of the aforementioned phe...
Article
In this study we investigate numerically the shear-induced agglomeration of cohesive inertial particles in a simple shear flow. We conduct series of numerical simulations by implementing a soft-sphere collision model. Post-processing tools are developed in-house to analyse the results of the simulations in terms of: transient and terminal numbers o...
Article
Full-text available
An understanding of agglomeration in multiphase flows by means of capillary bridges is important for various technical applications. One of the key parameters that describe the process is the probability of agglomeration, usually termed collision efficiency. In the present paper we study the collision efficiency by using Eulerian-Lagrangian computa...
Article
The present paper proposes a model for agglomeration of solid particles covered with a liquid flocculant. Rather then being derived by time-consuming numerical simulations of collision dynamics as the particles are in contact, the model is based on analytic relations: thus the computational cost is significantly reduced. The model was implemented i...
Article
Ni–W tapes of the micrometric thickness are considered as the basis for the cost-effective manufacturing of coated conductors – the 2nd generation of high-temperature superconductor (HTS). Many HTS applications involve widely-available and inexpensive liquid nitrogen. The transition from superconducting to normal state may however occurs due to une...
Conference Paper
Full-text available
The present paper describes a novel approach for CFD-modelling of liquid bridge agglomeration in multiphase flows. The model is based on the Lagrangian technique for the dispersed phase treatment where the bridge-dominated in-phase interactions are modelled with the use of analytic functions that come out from precursive theoretical solutions of in...
Article
This article describes the incorporation of a population balance model (PBM) based on the classes method into the commercial CFD-code STAR-CD. The numerical approach of the PBM solution was initially validated with experimental data on the agglomeration of polystyrene particles in a shear flow. The PBM was then incorporated into STAR-CD with the us...
Article
Full-text available
In this paper the performance characteristics, expressed as cut-size, grade-efficiency curve and pressure drop, have been determined for a hydrocyclone acting on highly viscous liquids. These results are of high quality and can serve as a benchmark for simulations and model predictions. To understand the results, CFD, large-eddy simulations of the...
Article
The topic of heat transfer between colliding particles or between particles impinging on solid surfaces is, in spite of its practical significance, still not widely studied in literature: efforts have, till now, led to only a handful of models. At the same time this problem is crucial not only for many types of multiphase flows but also for other s...
Article
Full-text available
The present paper shows a numerical investigation of dust lifting behind a moving pressure wave. The dispersion of combustible dust has previously been discovered to be a precursor to a potential dust explosion. Consequently, a growing interest on the subject has been observed in recent years. Numerous studies have been performed on dust lifting, h...
Article
The formation of capillary bridge formed by a liquid adsorbate is one of the main reasons for agglomeration in multiphase flows. Agglomeration takes place when the relative momentum of two colliding particles is fully consumed by the bridge. This article presents a theoretical study of the collisions of particles with adsorbed liquid taking into ac...
Conference Paper
Fires in the cable structures are a serious danger for the offshore facilities. Inflammations of the cables are mostly caused by cable overheating as a result of power loads in the net or by the shortcut circuits. Fire extinguishing comes, in the first place, to neutralization of the external flame on its surface. However, even when the external fl...
Article
Bends are integral parts of a pneumatic conveying system. However, the presence of bends often leads to undesirable phenomena such as roping, particle segregation and attrition, particle deposition and pipe abrasion. It is important to understand the particle motion in the vicinity of bends to better address these issues. In this work a single radi...
Article
This paper investigates heat transfer between particles during particle–particle and particle–wall collisions in fluid–solid flows. A model is described, which is based on the work by Sun and Chen (1988) [27], who described heat conduction between elastic, non-cohesive particles. The model of Sun and Chen is, in this work, extended to investigate h...
Article
Objective: The goal of this research was to compare side-to-side (STS) and end-to-side (ETS) anastomoses in a computer model of the arteriovenous fistula with computational fluid dynamic analysis. Methods: A matrix of 17 computer arteriovenous fistula models (SolidWorks, Dassault Systèmes, France) of artery-vein pairs (3-mm-diameter artery + 3-m...
Article
Full-text available
A two-fluid Eulerian-Eulerian model accounting for the contact interactions between obstruction and hummock, stopped before a structure, and ice floes has been developed. In this work the ice cover is considered to behave as a continuous stream of drifting ice surrounded by the water phase. The technique accounts for the ice-to-ice interactions. Co...
Article
Full-text available
This paper aims to study the flow of a solid particle over a deposit in transport and processing equipment. Tracking particles and fluid elements moving through single- and multi-phase systems is very useful for studying numerous flow processes and identifying anomalies happening in the processes. Using Positron emission tomography (PET) and posit...
Article
Magnetic fluids are widely used in the energy, pharmaceutical and aerospace industries. Their flow can be controlled by the use of an external magnetic field. The current work considers the process of deposit formation in such fluids under an external magnetic field. Initially the process of deposit formation was studied experimentally and the shap...
Article
In this paper, particle deposition in a particle-laden turbulent flow over an obstacle in a straight pipe is studied experimentally and numerically. A camera equipped with a microscope is used to observe the surfaces on which particle depositions may take place. The numerical study is performed using Eulerian-Lagrangian Reynolds-averaged Navier Sto...
Article
The “end of the vortex” (EoV) phenomenon, a flow instability that plays a crucial role in cyclone design and operation is studied in this article. In the experimental part of the study, tests were carried out to understand the origin and nature of the EoV and to study the effects of the flowrate through, and the length of, the cylindrical cyclone o...
Poster
Understanding the flow of particles inside a pipe is crucial for the energy related processing industry to avoid deposition and plugging by knowledge-based design. This paper aims to study the flow of a solid particle over a deposit in transport and processing equipment. Tracking particles and fluid elements moving through single- and multi-phase s...
Article
Fluid flows with cohesive particles are present in oil industry (e.g. natural gas/oil with hydrates, wax or asphaltenes), medicine (e.g. blood cells), nano- and ferro-fluidic applications (e.g. fluids with nanoparticles subject to the van der Waals and electrostatic interactions) and even in astrophysics (e.g. grains in planetary rings). Such flows...
Article
The flow of a fluid with suspended magnetic particles can be controlled and operated by a magnetic field. In the current paper we present a multiphase Computational Fluid Dynamics (CFD) model for the prediction of magnetic suspension behaviour in the vicinity of a magnet. The model is based on the Eulerian approach with elements of the kinetic th...