Thermocapillary convection in a 2D floating-zone with time-periodic temperature at the hot wall under reduced gravity = 무중력장 하에서 고온 측벽의 시간주기적 온도 변화를 가지는 2D floating-zone의 열모세관 대류

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Numerical solutions are made of thermocapillary convection of an incompressible fluid in a two-dimensional square floating-zone having a cold wall with constant temperature and an opposite hot wall with time-periodic sinusoidal temperature. Surfaces running between ends of the two walls having the temperature difference are assumed to be flat and adiabatic. The fluid in the floating-zone has normal thermocapillarity, and the Prandtl number is fixed to a unity. This study is aimed at investigating the effects of amplitude and frequency of temperature oscillations at the hot wall with varying the Marangoni number. Maximal fluctuations of the Nusselt number defined as the inner heat transfer at vertical mid-plane occur at the resonant frequency which is approximately the same with the main frequency in an oscillatory transient part of the Nusselt number for the steady state. The resonant frequency is depending on the Marangoni number but irrespective of the amplitude of the artificial temperature oscillations. The resonance phenomenon is caused by the phase difference of the surface flow and the return flow.
Advisors
Hyun, Jae-Minresearcher현재민researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2011
Identifier
467565/325007  / 020093081
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학전공, 2011.2, [ x, 63 p. ]

Keywords

Floating-zone; Marangoni effect; Thermocapillary convection; Resonant frequency; 공진 주파수; 부유띠; 마랑고니 효과; 열모세관 대류

URI
http://hdl.handle.net/10203/45839
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=467565&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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