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Heat transfer study of introducing volatile coolant into the hot viscous fluid for vapor cooling

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Indexed by:Journal Papers

Date of Publication:2004-08-25

Journal:Journal of Chemical Engineering of Chinese Universities

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:18

Issue:4

Page Number:420-424

ISSN No.:1003-9015

Key Words:热粘液;互溶性冷剂;汽化冷却;传热;界面汽化热阱

Abstract:研究了热粘液中引入挥发性冷剂进行汽化冷却的传热过程.在一垂直圆形循环管中,引入冷剂酒精液滴于热浓糖溶液中,获得了糖液的汽化冷却曲线;分析了冷剂通人量对瞬间主体温度及容积传热速率的影响,并以"界面汽化热阱"的概念对传热机理进行了分析.冷剂在热粘液中汽化,是以泡滴的形态进行的.由于酒精与糖液是互溶的,在圆形管中对于泡滴的形态以及酒精与浓糖溶液间的界面难以观察清楚,因而设计了一套便于观察、拍照和分析的由两块玻璃板组成的窄缝且外侧带有保温夹套的实验设备(类似于Hele-Shaw盒).在该设备中,对不互溶冷剂及可互溶冷剂在热浓糖溶液中汽化时形成泡滴的状态进行了比较,并分析了它们具有不同状态的原因.

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