서지주요정보
복사효과를 고려한 기체-입자 직접접촉식 열교환기 해석 = Analysis of a gas-particle direct-contact heat exchanger with radiation effect
서명 / 저자 복사효과를 고려한 기체-입자 직접접촉식 열교환기 해석 = Analysis of a gas-particle direct-contact heat exchanger with radiation effect / 박재현.
발행사항 [대전 : 한국과학기술원, 1998].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8008655

소장위치/청구기호

학술문화관(문화관) 보존서고

MAE 98008

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리뷰정보

초록정보

A direct contact heat exchanger using particle-suspended gas as a heat transfer medium is analyzed with an extended emphasis on the radiation, i.e., considering the radiation by both gas and particles. Nongray model for gas-particle two phase media is newly proposed. While the Runge-Kutta method is used for a numerical analysis of the momentum and energy equations, the finite volume method is utilized to solve the radiative transfer equation. This thesis consists of two parts. one is the analysis where the gray assumption is used and the other is focused on the nongray effect. First, the study assuming gray shows a notable effect by the gas radiation in addition to the particle radiation, especially when changing the chamber length as well as the gas and particle mass flow rate. When the gas and particle mass flow rate is raised, the gas temperature in the particle heater still increases as the gas absorption coefficient increases, which is different from the results for the small scale heat exchanger. However, the scattering effects by particles were found to be insignificant. Also, it is found that the one dimensional approximation is just valid for the optically thick condition. Secondly, It is evaluate that the nongray effect of water vapor in air preheater of gas-particle direct-contact heat exchanger. Only the gas is treated as nongray, while the particles are assumed gray. The absorption coefficient in gray model was calculated from the mean beam length. Present study shows that the gary model overestimates the radiation effect, compared with the nongray model.

서지기타정보

서지기타정보
청구기호 {MAE 98008
형태사항 xii, 89 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, 기체장에 대한 회체 가중치와 입자들에 대한 회체가중치 사이의 상관관계. - B, 복사전달방식에 대한 일차원 유한체적법. - C, 공간적으로 입자분포가 변화하는 경우의 기체-입자 2상매질에서의 복사열전달
저자명의 영문표기 : Jae-Hyun Park
지도교수의 한글표기 : 권세진
지도교수의 영문표기 : Se-Jin Kwon
학위논문 학위논문(석사) - 한국과학기술원 : 항공우주공학과,
서지주기 참고문헌 : p. 68-71
주제 직접접촉식열교환기
기체-입자 2상유동
2상매질에서의 복사열전달
Direct-contact heat exchanger
Gas-particle two phase flow
Radiative heat transfer in two phase media
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