Transactions of The Korean Society of Mechanical Engineers B 

About: Transactions of The Korean Society of Mechanical Engineers B is an academic journal published by Korean Society of Mechanical Engineers. The journal publishes majorly in the area(s): Heat transfer & Combustion. It has an ISSN identifier of 1226-4881. Over the lifetime, 2529 publications have been published receiving 3549 citations. The journal is also known as: Transactions of the KSME. B & Transactions of the Korean society of mechanical engineers B.

A Numerical Study of Natural Convection in a Square Enclosure with a Circular Cylinder at Different Vertical Locations

Abstract: Numerical calculations are carried out for the natural convection induced by temperature difference between a cold outer square cylinder and a hot inner circular cylinder. A two-dimensional solution for unsteady natural convection is obtained, using the immersed boundary method (IBM) to model an inner circular cylinder based on finite volume method, for different Rayleigh numbers varying over the range of . The study goes further to investigate the effect of an inner cylinder location on the heat transfer and fluid flow. The location of inner circular cylinder is changed vertically along the center-line of square enclosure. The number, size and formation of cell strongly depend on Rayleigh number and the position of inner circular cylinder. The changes in heat transfer quantities have been presented.

The Effects of the Anode Size and Position on the Limiting Currents of Natural Convection Mass Transfer Experiments in a Vertical Pipe

Abstract: Natural convection heat transfer rates in a vertical pipe were measured for number from 2.1x to 1.2x. Using the analogy concept, heat transfer experiments were replaced by mass transfer experiments. A cupric acid - copper sulfate () electroplating system was adopted as the mass transfer system and the mass transfer rates were measured. Comparison of the results with the existing laminar and turbulent natural convection heat transfer correlations on a vertical plate showed very good agreements except for the high case, where the boundary layer inside the vertical pipe interferes. The agreements showed the usefulness of the analogy experiment method. Using 3 different anode size and 6 different geometrical configurations, the effects of the anode size and position were explored. As expected, the anode size and position do not affect the limiting currents for most cases. These results will be used as the experimental background for the positioning and sizing of the anodes for a more complex experiment.

Optimum Design of Microchannel Heat Sinks

Abstract: In present study a methodology has been developed and applied for the optimum design and performance evaluation of microchannel heat sinks. The optimum design parameters include channel number and fin thickness. For a trial model of 127mm in length, 52.5mm in width, 16mm in height and 2.5mm in base thickness, the optimum channel number and the fin thinckness have been determined to be of 194 and 0.08359mm, respectively in laminar flow region. Performance of the optimally designed microchannel heat sinks has been compared with those having 50% and 150% of the number of channels. The results showed that the 50% and 150% designs increased the pumping power by 200% and 150%, respectively.

Large-Eddy Simulation of Turbulent Flow Past a Square Cylinder Confined in a Channel

Abstract: Turbulent flow past a square cylinder confined in a channel is numerically investigated by large eddy simulation (LES). The main objectives of this study are to extensively verify the experimental results of Nakagawa et al. [Exp. Fluids 27(3) (1999) 284] by LES and to identify the features of flows past a square cylinder confined in a channel in comparison with the conventional one in an infinite domain. The LES results obtained are in excellent agreement with the experiment both qualitatively and quantitatively. The well-known K a a vortex shedding is observed. However, the vortices shed from the cylinder are significantly affected by the presence of the plates; mean drag and fluctuation of lift force increase significantly. Furthermore, periodic and alternating vortex-rollups are observed in the vicinity of the plates. The rolledup vortex is convected downstream together with the corresponding K a a vortex; they form a counterrotating vortex pair. It is also revealed that the cylinder greatly enhances mixing process of the flow. � 2003 Elsevier Ltd. All rights reserved.

Streamline-Upwind Numerical Simulation of Two-Dimensional Confined Impinging Slot Jets

Abstract: In the present paper, flow and heat transfer characteristics of confined impinging slot jets have been numerically investigated using a SIMPLE-based segregated SUPG finite element method. For laminar jets, it is shown that the skin friction coefficient obtained from the present SUPG formulation approaches the grid-independent Galerkin solution inducing negligible false diffusion in the flow field when a moderate number of grid points are used. For turbulent jets, the k-turbulence model is adopted. The streamwise mean velocity and the heat transfer coefficient respectively agree very well with existing experimental data within limited ranges of parameters.