Kwang-Yong Kim

Kwang-Yong Kim
Inha University · Department of Mechanical Engineering

PhD

About

700
Publications
183,203
Reads
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8,517
Citations
Additional affiliations
March 2021 - present
Inha University
Position
  • Professor
Description
  • Distinguished Research Professor
March 2017 - February 2019
Inha University
Position
  • Dean
March 2010 - February 2021
Inha University
Position
  • Professor
Education
March 1984 - August 1987
Korea Advanced Institute of Science and Technology (KAIST)
Field of study
  • Fluid Mechanics, Turbulence Modeling
March 1979 - February 1981
Korea Advanced Institute of Science and Technology (KAIST)
Field of study
  • Fluid Mechanics
March 1974 - February 1978
Seoul National University
Field of study
  • Nuclear Engineering

Publications

Publications (700)
Article
Full-text available
Three-dimensional numerical investigations of a novel passive micromixer were carried out to analyze the hydrodynamic and thermal behaviors of Nano-Non-Newtonian fluids. Mass and heat transfer characteristics of two heated fluids have been investigated to understand the quantitative and qualitative fluid faction distributions with temperature homog...
Article
Full-text available
In modern jet engines, the effective cooling structure design is essential to both increase turbine efficiency and, in the meantime, maintain structural integrality. Pin-fin arrays play a crucial role in the cooling mechanism of the turbine blade internal cooling system. In the context of investigating the efficiency of cooling techniques using pin...
Article
Effects of the number of blades on the impeller-volute interaction and flow instability were studied for a centrifugal pump. The hydraulic performance and time-dependent flow field were analyzed by using the unsteady three-dimensional Reynolds-averaged Navier-Stokes equations with the k-ω based shear stress transport turbulence model. The grid depe...
Article
Full-text available
In modern jet engines, the effective cooling structure design is essential to both increase turbine efficiency and in the meantime, maintain structural integrality. Pin-fin arrays play an important role in the cooling mechanism of the turbine blade internal cooling system. Within the context of investigating the efficiency of cooling techniques usi...
Article
This work presents a casing treatment design using oblique slots to improve the stability of a single-stage transonic axial compressor, NASA Stage 37. 36 individual slots are distributed uniformly on the rotors’ shroud. Numerical simulations were performed to find the effects of the casing treatment on the compressor’s stability as well as the adia...
Article
Full-text available
In this work, a design optimization study was conducted to improve the performance of a membraneless microfluidic fuel cell with a double-bridge cross-section of the flow channel. Governing equations including Navier–Stokes, mass-transport, and Butler–Volmer equations were solved numerically to analyze the electrochemical phenomena and evaluate the...
Article
The present work performed a comprehensive investigation to find the effects of a dual-bleeding port recirculation channel on the aerodynamic performance of a single-stage transonic axial compressor, NASA Stage 37, and optimized the channel’s configuration to enhance the operating stability of the compressor. The compressor’s performance was examin...
Article
Full-text available
In this work, a numerical investigation was analyzed to exhibit the mixing behaviors of non-Newtonian shear-thinning fluids in Kenics micromixers. The numerical analysis was performed using the computational fluid dynamic (CFD) tool to solve 3D Navier-Stokes equations with the species transport equations. The efficiency of mixing is estimated by th...
Article
Full-text available
A double-bridge shape is proposed as a novel flow channel cross-sectional shape of a membraneless microfluidic fuel cell, and its electrochemical performance was analyzed with a numerical model. A membraneless microfluidic fuel cell (MMFC) is a micro/nano-scale fuel cell with better economic and commercial viability with the elimination of the poly...
Article
The review article introduces the development in membraneless microfluidic fuel cells (MMFCs) focusing on the microchannel geometry and electrode architecture and arrangement. Lamination of fuel and oxidant streams in a microchannel lets an MMFC work without physical membrane. The lack of convective mixing across liquid–liquid interface of two stre...
Article
Full-text available
A fluidic oscillator with a bent outlet nozzle was investigated to find the effects of the bending angle on the characteristics of the oscillator with and without external flow. Unsteady aerodynamic analyses were performed on the internal flow of the oscillator with two feedback channels and the interaction between oscillator jets and external flow...
Article
The paper presents a numerical investigation on the junction flow occurring at the intersection between a wall and a protruding circular cylinder. Simulations of flow for Reynolds number (Re) in the range [125 - 20000] have been carried out using OpenFOAM, an open source CFD tool. Plots of stream tracers have been used to qualitatively characterize...
Article
Full-text available
Membraneless microfluidic fuel cells (MMFCs) are being studied extensively as an alternative to batteries and conventional membrane fuel cells because of their simple functioning and lower manufacturing cost. MMFCs use the laminar flow of reactant species (fuel and oxidant) to eliminate the electrolyte membrane, which has conventionally been used t...
Article
Full-text available
During the last couple of decades, there have been rapid developments in analysis, design, and fabrication of micromixers [...]
Article
Full-text available
A casing treatment using inclined oblique slots (INOS) is proposed to improve the stability of the single-stage transonic axial compressor, NASA Stage 37, during operation. The slots are installed on the casing of the rotor blades. The aerodynamic performance was estimated using three-dimensional steady Reynolds-Averaged Navier-Stokes analysis. The...
Article
Full-text available
In this work, a comparative investigation of chaotic flow behavior inside multi-layer crossing channels was numerically carried out to select suitable micromixers. New micromixers were proposed and compared with an efficient passive mixer called a Two-Layer Crossing Channel Micromixer (TLCCM), which was investigated recently. The computational eval...
Article
In this study, a spiral ring cavity (SRC) is proposed to improve the operational stability of a centrifugal compressor. Aerodynamic performance of the compressor was analyzed using three-dimensional Reynolds-averaged Navier-Stokes equations with the shear stress transport turbulence model. To prove the superiority of the proposed cavity, adiabatic...
Article
Full-text available
Optimum configuration of a micromixer with two-layer crossing microstructure was performed using mixing analysis, surrogate modeling, along with an optimization algorithm. Mixing performance was used to determine the optimum designs at Reynolds number 40. A surrogate modeling method based on a radial basis neural network (RBNN) was used to approxim...
Article
Full-text available
In this study, a wavy microchannel heat sink with grooves using water as the working fluid is proposed for application to cooling microprocessors. The geometry of the heat sink was optimized to improve heat transfer and pressure loss simultaneously. To achieve optimization goals, the average friction factor and thermal resistance were used as the o...
Article
This paper investigates a novel casing treatment for an axial compressor that combines a circumferential casing groove with flow recirculation channels. This casing treatment is located in the rotor's tip region and comprises a single shallow circumferential groove with 36 recirculation channels that are distributed equally around the annulus. The...
Article
A novel flow channel configuration of a membraneless microfluidic fuel cell (MMFC) with porous flow‐through electrodes was investigated numerically. A numerical model was developed for the electrochemical analysis and validated using experimental data. The physical phenomena involved in the microfluidic fuel cell including the flow of the vanadium...
Article
Full-text available
Discrete cavities with guide vanes were developed and optimized to improve the operating stability of a centrifugal compressor. Various combinations of search algorithms and surrogate models were tested to find the best optimization methods. Aerodynamic analysis was performed using three-dimensional Reynolds-averaged Navier–Stokes equations. The nu...
Chapter
This chapter introduces the computational framework and provides a detailed analysis on the different numerical techniques for the analyses of flow and mixing in micromixers. Flow and mixing analyses are based on both the Eulerian and Lagrangian approaches; relative advantages and disadvantages of these two approaches and suitability to different t...
Chapter
Micromixers are essential components of lab-on-a-chip and micro-total analysis systems used for a variety of chemical and biological applications such as sample preparation and analysis, protein folding, DNA analysis, and cell separation. Due to the small characteristic dimension of micromixers, the flow is laminar in a Reynolds number range from 0...
Chapter
Micromixers are classified into two types: active and passive micromixers. Active micromixers promote mixing using moving parts or some external agitation/energy to stir the fluids. Magnetic energy, electrical energy, pressure disturbance, and ultrasonic are examples of the external energies to enhance mixing. Passive micromixers use geometrical mo...
Chapter
The mixing performance of a passive micromixer is sensitive to the geometry of the flow passages. Therefore, it is important to determine optimal configuration which maximizes the mixing performance of the micromixer. But, unfortunately, in some micromixers, enhancement of mixing performance is accompanied by a corresponding increase in pressure dr...
Chapter
This chapter summarizes the details of what have been covered in the previous chapters, and how to pursue those researches further.
Article
Full-text available
This study numerically evaluates the performance of flow control using fluidic oscillators on the NACA 0015 airfoil with a flap at different flap angles and different pitch angles of the oscillators. An inline array of fluidic oscillators is located just in front of the flap. Aerodynamic analysis was carried out using three-dimensional unsteady Rey...
Book
This book illustrates the computational framework based on knowledge of flow and mass transfer together with optimization techniques to solve problems relevant to micromixing technology. The authors provide a detailed analysis of the different numerical techniques applied to the design of micromixers. Flow and mixing analysis is based on both the E...
Article
Inclined discrete cavities are proposed to improve the operating stability of a centrifugal compressor while minimizing the flow loss, and optimized to simultaneously maximize the adiabatic efficiency and stall margin. Aerodynamic analysis was performed using three-dimensional Reynolds-averaged Navier–Stokes equations. The numerical results obtaine...
Article
Flow instability and its correlations with performance characteristics were investigated for a centrifugal pump with a volute. Unsteady three-dimensional Reynolds-averaged Navier-Stokes analysis was performed to analyze the flow and performance characteristics using the shear stress transport turbulence model. The grid dependence and temporal resol...
Article
Full-text available
This paper proposes T-shaped ribs as obstacles attached to the heat absorber plate in a rectangular solar air heater to promote heat transfer. The thermal and aerodynamic performance of the solar heater was numerically evaluated using three-dimensional Reynolds-averaged Navier–Stokes equations with the shear stress transport turbulence model. A par...
Article
Multi-objective design optimization was applied to the impeller and volute of a centrifugal pump using surrogate-based optimization techniques and three-dimensional Reynolds-averaged Navier-Stokes analysis. The objective functions used to improve the hydraulic performance and operating stability of the pump were the hydraulic efficiency at the desi...
Article
This study investigates the effects of inlet guide vane (IGV) and blade pitch angles on the steady and unsteady performance of a submersible axial-flow pump. To analyze the interaction between the IGVs and the rotor blades, both steady and unsteady three-dimensional Reynolds-averaged Navier-Stokes equations were used with shear stress transport tur...
Article
In the present study, numerical simulation was conducted to study both the internal and external flows of a fluidic oscillator in a quiescent environment and with a crossflow. Unsteady Reynolds-averaged Navier–Stokes analysis was used to evaluate the flow field. The blowing ratio was varied to understand the interaction between the free stream and...
Article
Two chaotic micromixers (Model A and Model B) based on the concept of split‐and‐recombine principle using multilayer microchannels were proposed, mixing performance was analysed numerically and experimentally in the wide range of Reynolds numbers. Fluid flow and mixing performance were numerically analysed by solving Navier‐Stokes equations. Microm...
Article
Full-text available
Submersible pumps are now in high demand due to the sporadic occurrence of recent torrential rains. The current study was carried out to investigate the hydraulic characteristics of a submersible axial-flow pump with a swept impeller and to optimize the impeller and diffuser shapes of the pump to enhance the hydraulic performance. Three-dimensional...
Article
The effects of the cross-sectional area of a volute on suction recirculation and cavitation in a centrifugal pump were investigated. The pump performance and fluid flow were analyzed using both steady and unsteady three-dimensional Reynolds-averaged Navier-Stokes analyses. The shear stress transport model was adopted as a turbulence closure model,...
Article
A performance analysis and three-objective design optimization were performed for the staggered partial diffuser vanes in a centrifugal pump using three-dimensional Reynolds-averaged Navier-Stokes equations. First, the performance of the diffuser vanes was evaluated for four different arrangements: full-height diffuser vanes, vaneless diffuser, hal...
Article
Full-text available
A wide range of existing passive micromixers are reviewed, and quantitative analyses of ten typical passive micromixers were performed to compare their mixing indices, pressure drops, and mixing costs under the same axial length and flow conditions across a wide Reynolds number range of 0.01–120. The tested micromixers were selected from five types...
Article
This study numerically investigates the effects of the installation location of fluidic oscillators on the aerodynamic performance of a NACA 0015 airfoil. The oscillators are embedded in the suction surface of the airfoil. An unsteady flow analysis was performed using three-dimensional Reynolds-averaged Navier-Stokes equations with a shear stress t...
Article
Full-text available
In this work, numerical and experimental analyses have been conducted to analyze the effect of different shapes of obstructions (diamond, rectangular and circular) on mixing performance of a micromixer with Tesla structures. Fluid flow behaviours were numerically analysed by solving the Navier-Stokes equations using convection-diffusion model in th...
Article
Full-text available
This paper presents the effects of airflow bleed from the rotor shroud surface between leading and trailing edges on aerodynamic and structural performances of a single-stage transonic axial compressor, NASA stage 37, using three-dimensional Reynolds-averaged Navier–Stokes equations with the k–ε turbulence model. A small airflow mass flow rate is b...
Article
Full-text available
The present work proposes a planar micromixer design comprising hybrid mixing modules of split-and-recombine units and curved channels with radial baffles. The mixing performance was evaluated numerically by solving the continuity and momentum equations along with the advection-diffusion equation in a Reynolds number range of 0.1–80. The variance o...
Article
This article reports a novel design of a micromixer showing efficient mixing by creating vortex flow in a microchannel. The main microchannel splits and recombines into two sub-channels at a tangential position that facilitates the generation of vortex flow. The height and width of the sub-channels are half the height and width of the main microcha...
Article
Full-text available
A laminar flow micro fuel cell comprising of bridge-shaped microchannel is investigated to find out the effects of the cross-section shape of the microchannel on the performance. A parametric study is performed by varying the heights and widths of the channel and bridge shape. Nine different microchannel cross-section shapes are evaluated to find e...
Article
The effects of a rotor-stator interface model on the hydraulic and suction performance of a single-stage centrifugal pump have been evaluated. A three-dimensional Reynolds-averaged Navier-Stokes (RANS) analysis was performed using the shear-stress transport turbulence model. The cavitating flow was simulated using a homogeneous two-phase mixture mo...
Article
Full-text available
The three-dimensional geometry of a micromixer with an asymmetrical split-and-recombine mechanism was optimized to enhance the fluid-mixing capability at a Reynolds number of 20. Single and multi-objective optimizations were carried out by using particle swarm optimization and a genetic algorithm on a modeled surrogate surface. Surrogate modeling w...
Article
Full-text available
This paper handles a hybrid multiple optimization technique to concurrently enhance hydraulic efficiency and decrease unsteady radial forces resulting from fluid-induced vibration of a single-channel pump for wastewater treatment. A single-channel impeller and volute was optimized systematically by using a hybrid particle swarm optimization and gen...
Article
The installation conditions of fluidic oscillators embedded in a hump surface were numerically investigated to improve the separation control of the flow over the hump. Unsteady flow analysis was performed using three-dimensional Reynolds-averaged Navier–Stokes equations with a modified shear stress transport model. The numerical results were valid...
Article
A converging-diverging film-cooling hole was designed by combining a converged inlet with a fan-shaped exit. The performance of the proposed design was analyzed numerically and compared to that of a fan-shaped hole. The film-cooling effectiveness was evaluated using three-dimensional Reynolds-averaged Navier-Stokes equations with the shear stress t...
Conference Paper
This paper presents a study of the effects of blade pitch angle and inlet guide vane (IGV) angle on the performance of a submersible axial-flow pump. To analyze the interaction effects between the IGVs and the rotor blades, both steady and unsteady three-dimensional Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence mo...
Article
An electroosmotic micromixer with two‐layer microchannels of a nozzle‐and‐diffuser structure was proposed and its mixing performance was analyzed. The microchannels featured heterogeneously charged surfaces on the slanted walls of the nozzle sections. Numerical analysis of the flow and mixing was performed using the three‐dimensional Poisson‐Boltzm...
Article
This study investigates the effects of sweep angle, blade pitch angle, and inlet angle of the propeller hub on the hydraulic characteristics of a submersible axial flow pump by using three-dimensional Reynolds-averaged Navier-Stokes equations. The shear stress transport turbulence model was used for the analysis of turbulence. The finite volume met...
Cover Page
Full-text available
Drawing on extensive research and experience, this timely reference brings together numerical optimization methods for fluid machinery and its key industrial applications. It logically lays out the context required to understand computational fluid dynamics by introducing the basics of fluid mechanics, fluid machines and their components. Readers a...
Article
To improve cooling effectiveness of film-cooling hole, bending of hole was investigated and optimized using surrogate modelling based on three-dimensional Reynolds-averaged Navier-Stokes analysis. The turbulence was modeled using a shear stress transport model. The spatially-averaged film-cooling effectiveness was employed as the objective function...
Article
The present work proposes a micromixer consisting of circular mixing modules and three-dimensional sub-channels, which uses a split-and-recombination process and unbalanced collision as the main mixing mechanisms. Three micromixer configurations with different locations of the forward- and backward-facing steps were tested at several Reynolds numbe...
Article
To obtain a free copy of this article use this link: https://www.tandfonline.com/eprint/3nnrwP37zF3eU6XVcREX/full?target=10.1080/10407782.2019.1599272. A hybrid heat sink design with microchannels and stepped pin-fins is introduced for the hotspot-targeted thermal management of microprocessors. The thermal and hydraulic performance were assessed nu...
Article
Full-text available
The impeller and volute of a single-channel pump used for wastewater treatment were simultaneously optimized to improve the hydraulic efficiency and reduce unsteady radial force sources due to the impeller–volute interaction. Steady and unsteady Reynolds-averaged Navier–Stokes equations were solved with the shear stress transport turbulence model a...
Article
To obtain a free copy of this article use this link: https://www.tandfonline.com/eprint/3nnrwP37zF3eU6XVcREX/full?target=10.1080/10407782.2019.1599272. A hybrid heat sink design with microchannels and stepped pin-fins is introduced for the hotspot-targeted thermal management of microprocessors. The thermal and hydraulic performance were assessed n...
Book
Drawing on extensive research and experience, this timely reference brings together numerical optimization methods for fluid machinery and its key industrial applications. It logically lays out the context required to understand computational fluid dynamics by introducing the basics of fluid mechanics, fluid machines and their components. Readers a...
Chapter
Fluid mechanics has two parts: dynamics and kinematics. The kinematics describes the motion of the fluid without any consideration of the forces that cause fluid motion. Fluid motion where the forces are considered is called fluid dynamics. Fluid flows can be classified according to several criteria; for example, considering viscosity, compressibil...
Article
This chapter discusses different optimization techniques mostly for surrogate‐based optimization. A decision‐making process in engineering depends on a single parameter or multiple parameters that affect the system performance. In surrogate‐based optimization, surrogate models approximate the data and predict approximate results. In multi‐objective...
Chapter
Renewable energy sources are generally clean, emissions‐free power production resources. This chapter discusses few renewable energy resources. Among them, many use turbomachinery in one form or other. Wind turbine technology is dominated by very large open rotors of the horizontal‐axis type i.e. horizontal‐axis wind turbines (HAWTs). In optimizati...
Chapter
This chapter describes optimization techniques for maximizing industrial fluid machinery performance. Both single‐ and multi‐objective methods are explained in detail that are capable of dealing with both single‐ and/or multi‐point problems. The most common and relevant problem type concerns shape optimization of machine stationary and rotating par...