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http://dx.doi.org/10.5293/KFMA.2008.11.1.052

Design Optimization of a Channel Roughened by Dimples Using Weighted Average Surrogate Model  

Lee, Ki-Don (인하대학교 기계공학과 대학원)
Kim, Kwang-Yong (인하대학교 기계공학부)
Publication Information
The KSFM Journal of Fluid Machinery / v.11, no.1, 2008 , pp. 52-60 More about this Journal
Abstract
Staggered dimples printed on opposite walls of an internal cooling channel are formulated numerically and optimized to enhance heat transfer performance. Nusselt number and friction factor based objectives are considered and a weighted average surrogate model is used to approximate the data generated by numerical simulation. The dimpled channel shape is defined by three geometric design variables, and the design point within design space are selected using Latin hypercube sampling. A weighted-sum method for multi-objective optimization is applied to integrate multiple objectives into a single objective. By the optimization, the objective function value is improved largely and heat transfer rate is increase much higher than pressure loss increase due to shape deformation. Channel with vertically non-symmetric optimum dimples is tested and found that the best appears if dimples on opposite wall are displaced by one quarter of dimple spacing.
Keywords
Design Optimization; Dimple; Weighted Average Surrogate Model; Latin Hypercube Sampling; Heat Transfer; Friction Factor;
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