Experimental study on the heat transfer characteristics of a micro scale impinging jet = 미세 충돌 제트의 열전달 특성에 관한 실험적 연구

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Heat transfer to a single, axisymmetric impinging jet was studied using a thermal chip. The design and fabrication for the thermal chip with arrays of temperature sensors using diode and heaters is presented. The parameters varied in the testing were jet diameter (0.1mm, 0.2mm, 0.5mm and 1mm), Reynolds number (1000, 5000, 10000) and dimensionless jet-to-target spacing, H/d (2.5, 5, 7.5, 10, 20). The tests were performed using air as the working fluid. Results are presented in the form of local heat transfer coefficients as a function of dimensionless radial distance from the stagnation point, r/d. The local heat transfer coefficient calculations account for lateral conduction within the thermal chip, which, in contrast to conventional practice, has been shown to be non-negligible. Local heat transfer coefficients has been determined that (i) the Nusselt number attains its maximum value at H/d < 8, which is identical result as that of a macro scale, (ii) increasing the Reynolds number yields higher Nusselt number, as expected (iii) the smallest jet diameter yielded the largest heat transfer coefficient for a given Reynolds number.
Advisors
Kim, Sung-Jinresearcher김성진researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2007
Identifier
264197/325007  / 020053625
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학전공, 2007.2, [ xi, 66 p. ]

Keywords

Micro scale impinging jet; 미세 충돌 제트

URI
http://hdl.handle.net/10203/45571
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=264197&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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