서지주요정보
강제 대류 하에서 수평판상의 서리 성장 = Frost formation on a flat horizontal plate under forced convection
서명 / 저자 강제 대류 하에서 수평판상의 서리 성장 = Frost formation on a flat horizontal plate under forced convection / 김종남.
저자명 김종남 ; Kim, Jong-Nam
발행사항 [서울 : 한국과학기술원, 1985].
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소장정보

등록번호

4103071

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 8515

휴대폰 전송

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초록정보

Frost formation is an important phenomenon in the cryogenic industries. In some instances, frost deposition is deleterious and leads to energy waste. The phenomenon of frost formation is a complicated process in which heat and mass transfer are at work simultaneously. This paper deals with an experimental investigation and a theoretical work of the effect of the air humidity, velocity, temperature and plate wall temperature on frost formation rate on a horizontal flat plate, held at subfreezing temperature. The frost thickness increased with decreasing plate wall temperature and with increasing air humidity. The frost density was high at the high air humidity, velocity and plate wall temperature. Due to the increasing resistance of the frost layer to heat flow, the surface temperature of the frost increased during the run. A theoretical model based on molecular diffusion of water vapor at the frost surface and quasi-steady state assumption, by using Dietenbergers'(1983) thermal conductivity equation, showed good agreement with the experimental data. The values of the local heat and mass transfer coefficients under frosting condition were larger than those estimated by the smooth wall Nusselt number equation and Chilton-Colburn analogy. The reasons for this fact were considered to be due to the interference of heat and mass transfer and the frost surface roughness. Quasi-steady state overall heat transfer coefficient between humid air and plate wall covered with frost was found to increase with increasing air humidity and velocity.

서지기타정보

서지기타정보
청구기호 {MCE 8515
형태사항 v, 65 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, 서리의 열전도도식. - B, 열 및 물질전달계수식
저자명의 영문표기 : Jong-Nam Kim
지도교수의 한글표기 : 김지동
지도교수의 영문표기 : Jee-Dong Kim
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 54-57
주제 Frost.
대류. --과학기술용어시소러스
서리. --과학기술용어시소러스
Heat --Convection, natural.
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