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Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm

Minimization of the thermal resistance and pressure drop of a microchannel heat sink is desirable for efficient heat removal which is becoming a serious challenge due to the demand for continuous miniaturization of such cooling systems with increasing high heat generation rate. However, a reduction...

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Main Authors: Mohd. Ghazali, Normah, Oh, Jong Taek, Nguyen, Ba Chien, Choi, Kwang-Il, Ahmad, Robiah
Format: Article
Published: Elsevier Ltd. 2015
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/58118/
http://dx.doi.org/10.1016/j.enconman.2015.02.008
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spelling my.utm.581182021-10-11T02:53:53Z http://eprints.utm.my/id/eprint/58118/ Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm Mohd. Ghazali, Normah Oh, Jong Taek Nguyen, Ba Chien Choi, Kwang-Il Ahmad, Robiah TJ Mechanical engineering and machinery Minimization of the thermal resistance and pressure drop of a microchannel heat sink is desirable for efficient heat removal which is becoming a serious challenge due to the demand for continuous miniaturization of such cooling systems with increasing high heat generation rate. However, a reduction in the thermal resistance generally leads to the increase in the pressure drop and vice versa. This paper reports the outcome of optimization of the hydraulic diameter and wall width to channel width ratio of square and circular microchannel heat sink for the simultaneous minimization of the two objectives; thermal resistance and pressure drop. The procedure was completed with multi-objective genetic algorithm (MOGA). Environmentally friendly liquid ammonia was used as the coolant and the thermophysical properties have been obtained based on the average experimental saturation temperatures measured along an ammonia-cooled 3.0 mm internal diameter horizontal microchannel rig. The optimized results showed that with the same hydraulic diameter and pumping power, circular microchannels have lower thermal resistance. Based on the same number of microchannels per square cm, the thermal resistance for the circular channels is lower by 21% at the lowest pumping power and lower by 35% at the highest pumping power than the thermal resistance for the square microchannels. Results obtained at 10 ° C and 5 ° C showed no significant difference probably due to the slight difference in properties at these temperatures. Elsevier Ltd. 2015 Article PeerReviewed Mohd. Ghazali, Normah and Oh, Jong Taek and Nguyen, Ba Chien and Choi, Kwang-Il and Ahmad, Robiah (2015) Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm. Energy Conversion And Management, 102 . pp. 59-65. ISSN 1968-9041 http://dx.doi.org/10.1016/j.enconman.2015.02.008 DOI:10.1016/j.enconman.2015.02.008
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Mohd. Ghazali, Normah
Oh, Jong Taek
Nguyen, Ba Chien
Choi, Kwang-Il
Ahmad, Robiah
Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
description Minimization of the thermal resistance and pressure drop of a microchannel heat sink is desirable for efficient heat removal which is becoming a serious challenge due to the demand for continuous miniaturization of such cooling systems with increasing high heat generation rate. However, a reduction in the thermal resistance generally leads to the increase in the pressure drop and vice versa. This paper reports the outcome of optimization of the hydraulic diameter and wall width to channel width ratio of square and circular microchannel heat sink for the simultaneous minimization of the two objectives; thermal resistance and pressure drop. The procedure was completed with multi-objective genetic algorithm (MOGA). Environmentally friendly liquid ammonia was used as the coolant and the thermophysical properties have been obtained based on the average experimental saturation temperatures measured along an ammonia-cooled 3.0 mm internal diameter horizontal microchannel rig. The optimized results showed that with the same hydraulic diameter and pumping power, circular microchannels have lower thermal resistance. Based on the same number of microchannels per square cm, the thermal resistance for the circular channels is lower by 21% at the lowest pumping power and lower by 35% at the highest pumping power than the thermal resistance for the square microchannels. Results obtained at 10 ° C and 5 ° C showed no significant difference probably due to the slight difference in properties at these temperatures.
format Article
author Mohd. Ghazali, Normah
Oh, Jong Taek
Nguyen, Ba Chien
Choi, Kwang-Il
Ahmad, Robiah
author_facet Mohd. Ghazali, Normah
Oh, Jong Taek
Nguyen, Ba Chien
Choi, Kwang-Il
Ahmad, Robiah
author_sort Mohd. Ghazali, Normah
title Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
title_short Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
title_full Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
title_fullStr Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
title_full_unstemmed Comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
title_sort comparison of the optimized thermal performance of square and circular ammonia-cooled microchannel heat sink with genetic algorithm
publisher Elsevier Ltd.
publishDate 2015
url http://eprints.utm.my/id/eprint/58118/
http://dx.doi.org/10.1016/j.enconman.2015.02.008
_version_ 1715189639204044800
score 13.211869

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