## About

53

Publications

16,718

Reads

**How we measure 'reads'**

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more

184

Citations

Citations since 2016

## Publications

Publications (53)

For several decades, the use of hydropower generation using hydrokinetic turbines has grown rapidly, aiming to get energy alternatives and reduce the dependency on fossil energy. Despite it has low efficiency, the vertical axis hydrokinetic turbine (VAHT) has been used to utilize hydro energy and has a promising result. A previous study had stated...

There is a global need for lithium-ion battery (LIB) with high specific power density and energy density; however, LIB is very sensitive to temperature. To guarantee the safety and performance of LIB, mini channel liquid-cooled plate was applied as a part of battery thermal management system. In this research, the effect of water mass flow rate and...

This paper assesses the heat transfer performance of nanofluids containing a core–shell structure of SiO2 –TiO2 nanoparticles of low concentration in a mixture of water and ethylene glycol (EG) in a commercially available heat exchanger. For heat transfer analysis, 0–0.025% of SiO2 –TiO2 nanoparticles were employed in a finned-tube cross-flow heat...

The simplest equations with variable coefficients are considered in this research. The purpose of this study is to extend the procedure for solving the nonlinear differential equation with variable coefficients. In this case, the generalized Riccati equation is solved and becomes a basis to tackle the nonlinear differential equations with variable...

This work examines the diffusion equation in curvilinear coordinates by using the method of characteristics. The method is commonly applied to solve first order partial differential equations. Applying the method to the diffusion equation, the main difficulty is when the general case is considered i.e., produces variable coefficients. The method ut...

The aim of this work is to study a mathematical modelling and simulation for predicting the thermal performance heat-pipe evacuated a solar collector for water heater, which was considered the temperature distribution along the tube axis and radius. This model used to help in studying the dynamic behaviour of the system design and the effect of inf...

HAWT with three blades often used because it has the highest coefficient of performance among other turbines. The airfoil used is Clark-Y type because it has a high glide ratio (coefficient lift/coefficient drag) in the application of subsonic flow. The main purpose of this study is to increase the power coefficient value obtained by the increase o...

Due to its high energy concentration, hydrokinetic energy from tidal and rivers flow provides great expectation. One of the effective ways to meet the energy production target is to reduce the installation and maintenance effort by arranging turbines in such configuration, known as hydrokinetic turbine array. The performance of array configuration...

Organic liquid waste from food production industry is inevitable. High chemical oxygen demand (COD) contents in organic liquid waste could disrupt the water ecosystem. On the other hand, COD contents can be reduced and utilized to produce biogas by UASB reactor. However, there is a problem in operating UASB reactor, namely the high biomass content...

Heat conversion technologies need to be developed to take advantage of the necessary increase in the supply renewable energy. Organic Rankine Cycle (ORC) is suited for these applications, mainly because of the ability to recover low-grade heat. Generating electricity by utilizing electric furnace #4 off-gas through Organic Rankine Cycle (ORC) syste...

High Voltage Electrode Boiler (HVEB) is a high pressure saturated boiler that converts power-to-heat. HVEB is promising to be applied to industries that have a source of energy derived from hydro renewable energy. The methodology to estimate HVEB future performance is developed in three steps. The First step is designed to mass and heat balance HVE...

This study aims at designing the solar power system for ecological conservation, i.e., sea turtle conservation at the Banyuwangi Sea Turtle Foundation (BSTF), which requires electricity for the pump station, heating and lighting. The solar power system design was aided with the daily solar irradiance derived from sunshine duration data from 1980 to...

Heat Exchanger Unit at Central Gathering Station 5 (CGS 5) Chevron Pacific Indonesia Ltd. is an industry component to exchange heat of production fluid into CGS. CGS facility consists of Oil Treatment Plant (OTP) and Water Treatment Plant (WTP). Production Fluid (gas-oil-water-sand mixture) from field and test station entering OTP facility first is...

This study aims to simulate and present the hourly thermal analysis of a forced convection solar dryer along with the parametric analysis of the drying process made using the drying characteristics of green pepper. Under the consideration of Rwanda weather condition on August 21st, the designed solar collector shows low performance before noon and...

Solid electrolyte interface (SEI) is a critical factor that influences battery performance. SEI layer is formed by the decomposition of organic and inorganic compounds after the first cycle. This study investigates SEI formation as a product of electrolyte decomposition by the presence of flouro‐o‐phenylenedimaleimaide (F‐MI) additive. The presence...

The nonlinear lithium-ion transport equation with variable diffusion coefficient is considered in this research. The solution is produced by transforming the second order spatial variable into the first order differential in, ξ. The method of characteristics is then implemented for covering the initial-boundary conditions. Several interesting resul...

This work examined the conservation equations in curvilinear coordinates using the method of characteristics. The method is commonly applied to solve first-order partial differential equations. When applying this method to the conservation laws, the main difficulty is mass and momentum equations which are simultaneous and nonlinear PDEs. The method...

The Diffuser Augmented Wind Turbine (DAWT) offers potentials to cope with the wind availability situation like in Indonesia, i.e. with yearly average of 3–5 m/s. In this paper, computational CFD studies to get insight into the role of adding a flange (at the trailing edge of previously proposed diffuser with interior wall model [1]) to the wind vel...

Research on Freshwater and Seawater batteries, which using Al and Cu electrodes at variation of different electrolyte salinity, distance between electrodes and flowrate of electrolyte has been carried out. The galvanostatic discharge and Electrochemical Impedance Spectroscopy (EIS) of Al and Cu in seawater were investigated. The results showed the...

Ternate waters of North Maluku is one of Indonesian eastern waters whose maritime weather is often unpredictable. Weathers prediction is important to avoid accidents in the waters. The aim of this research is to obtain a predictor model of wave’s height and current’s speed suitable for the Ternate waters using Takagi-Sugeno fuzzy logic. The data us...

This paper proposes an optimization algorithm based on human fight and learn from each duelist. The proposed algorithm starts with an initial set of duelists. The duel is to determine the winner and loser. The loser learns from the winner, while the winner try their new skill or technique that may improve their fighting capabilities. A few duelists...

The method to solve the nonlinear differential equation with variable coefficients is presented in this work. The method is based on the application of general Riccati equation, which is substituted into the considered nonlinear equation and produce polynomial equation. The polynomial order higher than four is reduced into the fourth order and solv...

The design of plant-wide control system to optimize electricity production in geothermal power plant is proposed in this research. The objective is to overcome the deficiency due to changes in the characteristics of production well and fluctuation in electricity demand load. The proposed plant-wide control system has two main tasks; to maintain pro...

Waste heat recovery generation (WHRG) is a power plant system that utilizes the flue gas to generate an electrical power in cement industry. This plant has various unit operations, such as economizer, evaporator, superheater, steam drum, and turbine. To design WHRG plant, steam drum needs to be controlled in the first place, for the reason that thi...

This paper proposes an optimization algorithm based on how human fight and
learn from each duelist. Since this algorithm is based on population, the
proposed algorithm starts with an initial set of duelists. The duel is to
determine the winner and loser. The loser learns from the winner, while the
winner try their new skill or technique that may im...

p>Surabaya is a metropolitan city in Indonesia. As well as the second largest city in Indonesia, with average yearly GDP growth of Surabaya increased 5 % of the national GDP, Surabaya has attraction for the urbanization and very strategic for the investors to build their industry in Surabaya. This leads to industrial sector, transportation, and the...

In this research, cooling system optimization using thermal energy storage (TES) in shopping center buildings was investigated. Cooling systems in commercial buildings account for up to 50% of their total energy consumption. This incurs high electricity costs related to the tariffs determined by the Indonesian government with the price during peak...

In this research, cooling system optimization using thermal energy storage (TES) in shopping center buildings was investigated. Cooling systems in commercial buildings account for up to 50% of their total energy consumption. This incurs high electricity costs related to the tariffs determined by the Indonesian government with the price during peak...

Lithium ion batteries have gained increasing attention in the last two decades. Perfoming electrolyte additive into lithium ion battery could enhance the baterry performance. However several studies on electrolyte additive only show the experimental data. The behavior of battery kinetic inside the battery and the ionic diffusion during operation wa...

The method for the determination of optimum operating condition of geothermal powerplant is developed in this paper. The purpose of the method is to develop a computation module in order to find maximum electricity production. The optimum process conditions are then defined according to the change of fluid properties in the wellhead. This will incr...

The three-dimensional incompressible flows described by Navier-Stokes equations and the continuity equation are solved in this work with the application of the transformed coordinate () kz t ξ ς = −. The solution is proposed to be in the form V = ∇Φ + ∇ × Φ where Φ is a potential function that is defined as () () () , , P x y R y S ξ ξ Φ =. The pot...

Higher order linear differential equations with arbitrary order and variable coefficients are reduced in this work. The method is based on the decomposition of their coefficients and the approach reduces the order until second order equation is produced. The method to find closed-form solutions to the second order equation is then developed. The so...

Numerical study was conducted on the effect a variation of flange angle on diffuser DAWT performances using Computational Fluid Dynamics (CFD). This research objective is to perform and analyze the flow characteristics such as Velocities profile and static pressure profile on the effect of diffuser’s flat flanged tilt angle. Verification of computa...

The three-dimensional incompressible viscous flows are solved in this work with the application of the transformed coordinate which defines as a set of functionals, hi(ζ) = kix + liy + miz-cit. The solution is proposed from the base of general Riccati equation, which is firstly substituted into the Navier-Stokes equations to produce the polynomial...

The three-dimensional incompressible Navier-Stokes equations are solved in this work with the application of the transformed coordinate which defines as a set of functionals, . The solution is proposed from the base of higher order polynomial first order differential equation, which is firstly reduced into the Riccati equation. The Riccati equation...

The thermal comfort is important aspect for keeping very low birth weight (VLBW) newborn warm. Incubator should provide neutral temperature environment to achieve the thermal comfort so that the newborn won't suffer hypothermia due to higher heat losses. Additional overhead screen might help toward a better thermal comfort for nursing newborn in in...

An exact solution of the three-dimensional incompressible Navier–Stokes equations with the continuity equation is produced in this work. The solution is proposed to be in the form V=∇Φ+∇×Φ where Φ is a potential function that is defined as Φ=P(x,y,ξ)R(y)S(ξ), with the application of the coordinate transform ξ=kz−ς(t). The potential function is firs...

The three-dimensional incompressible Navier–Stokes equations with the continuity equation are solved analytically in this work. The spatial and temporal coordinates are transformed into a single coordinate ξ. The solution is proposed to be in the form V=∇Φ+∇×Φ where Φ is a potential function that is defined as Φ=P(x,ξ)R(ξ). The potential function i...

Incompressible Navier-Stokes equations are reviewed in this work. Three-dimensional Navier-Stokes equations are solved analytically. The Mathematical derivation shows that the solutions for the zero and constant pressure gradients are similar. Descriptions of the proposed formulation and validation against two laminar experiments and three differen...

Formulasi solition berdasarkan persamaan Maxwell Navier-Stokes dianalisis dalam penelitian ini. Penelitian ini merupakan aplikasi dari penelitian ini merupakan aplikasi dari peneltian sebelumnya mengenai penciptaan soliton pada persamaan gelombang secara umum yang kali ini ditrapkan pada gelombang hidrodinamika. Solusi persamaan gelombang diubah ke...

Recently, the complexity of 3-D flow around airfoil/flat plate junction at endwall region has attracted many researchers of Aerodynamics. The majority of its experimental and numerical observations are conducted to compressor cascade. Because of that importance, stronger conceptual basis of 3-D flow is required, so the present study has stressed on...

Abstrak Persamaan gelombang ditinjau kembali pada penelitian ini. Penyelesaian persamaan gelombang berbentuk soliton dapat dilakukan dengan menggunakan 2 syarat menurut tinjauan spatial dalam hal dispersi gelombang. Metode yang digunakan dalam penelitian ini adalah penyelesaian persamaan gelombang berbentuk periodik diubah ke dalam bentuk soliton d...

The solution in the special classes of V and V of Navier-Stokes equations is investigated in this work. Analysis is taken using the vorticity equations rather than the original Navier Stokes equations based on the work of Chae and Choe (1999). Derivations show that the corresponding problem can be transformed to the class of li...

## Projects

Projects (4)

Industrial Consultancy Program to provide efficient combustion

The goal is achieving more flexibility and robust of Duelist Algorithm in control and optimization aplications.