Heat transfer and structure of flow at boiling of refrigerant R134a in channels with inserts in the form of finned twisted tape

被引：1
|
作者：
Shishkin, A. V. [1 ]
Tarasevich, S. E. [1 ]
机构：
[1] Kazan Natl Res Tech Univ, Kazan, Russia
来源：
6TH INTERNATIONAL CONFERENCE HEAT AND MASS TRANSFER AND HYDRODYNAMICS IN SWIRLING FLOWS | 2018年 / 980卷
关键词：
D O I：
10.1088/1742-6596/980/1/012012
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The paper presents the results of experimental study of heat transfer for the refrigerant R134a flow in the channels with finned twisted tape inserts at bubble boiling. The flow regimes implemented under the given conditions are shown. The stable cord-like flows appear at boiling in channels with twisted tape inserts and high vapor content when the liquid phase moves in the form of a stream (cord) along the central part of the tape, which is not an active heat exchange surface. At boiling this can lead to an increase in the length required for complete liquid evaporation. Existing geometric modifications of twisted tapes are used in the heat-exchange equipment at forced convection of the coolant and do not solve the problem of cord-like flows elimination. The present work discusses the experimental study of heat transfer at boiling of refrigerant R134a in the channels with twisted tape inserts that have fins on its surface.
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页数：5
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