Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Thermal Analysis of a Radial Heat Sink with Radiation and Natural Convection

복사 열전달을 고려한 자연대류 원형 히트싱크 열전달 해석

  • Received : 2011.07.22
  • Accepted : 2012.01.25
  • Published : 2012.04.01
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Abstract

A radial heat sink, adopted to LED(light emitting diode) downlight, was optimized. Discrete transfer radiation model (DTRM) was used to calculate radiation heat transfer, and numerical model was verified with experimental results. The effects of number of fin, long fin length and middle fin length on overall thermal resistance and radiation heat transfer were analyzed. As the emissivity increased, thermal resistance decreased due to the increment of radiation heat transfer. The radial heat sink was optimized and optimum number of long fins is 19~28, optimum length of long fin is about half of radius of heat fink and optimum fin ratio is 0.4~0.7.

본 연구는 LED 조명기구에 적합한 원형 히트싱크의 최적설계를 수행하였다. DTRM 복사 모델을 이용하여 자연대류와 복사 열전달을 수치적으로 해석하였고, 수치모델을 실험을 통하여 검증하였다. 휜 개수, 긴 휜 길이, 중간 휜 길이가 전체 열저항 및 복사 열전달에 미치는 영향을 조사하였고, 그 결과 방사율이 증가할수록 복사 열전달의 크기는 증가하여 열저항은 감소하지만, 인자 변화에 따른 전체 열저항의 경향성은 거의 일정하였다. 원형 히크싱크의 최적화를 수행하였고, 최적화된 긴 휜의 개수는 19~28 개, 긴 휜의 길이는 히트 싱크의 반지름의 1/2 이고, 휜의 길이 비는 0.4~0.7 사이의 값을 얻었다.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

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Cited by

  1. Investigation of Natural Convective Heat Flow Characteristics of Heat Sink vol.37, pp.1, 2013, https://doi.org/10.3795/KSME-B.2013.37.1.027