Heat transfer, flow regime and instability of a nano- and micro-porous structure evaporator in a two-phase thermosyphon loop

被引：58

作者：

Khodabandeh, Rahmatollah ^{[1
]}

Furberg, Richard ^{[1
]}

机构：

[1] Royal Inst Technol KTH, Dept Appl Thermodynam & Refrigerat, Inst Energy Technol, Sch Ind Engn & Management, Stockholm, Sweden

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2010年 / 49卷 / 07期

关键词：

Instability; Thermosyphon loop; Natural circulation; Heat transfer; Electronic cooling; Nano- and micro-porous structure surfaces; BOILING CRISIS PHENOMENON; NATURAL CIRCULATION; START-UP; PRESSURE; MECHANISM; THERMOHYDRAULICS; PERFORMANCE; EXCURSION; SURFACE; FC-72;

D O I：

10.1016/j.ijthermalsci.2010.01.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Two-phase flow instabilities which may occur at low and high heat loads were studied for a thermosyphon loop with R134a as refrigerant. The heat transfer surface of the evaporator was enhanced with a copper nano- and micro-porous structure. The heat transfer of the enhanced evaporator was compared to a smooth surface evaporator. Finally, the influence of the liquid level and the inside diameter of the riser on the instability of the system have been investigated. It was found that the enhanced structure surface decreased the oscillations at the entire range of heat fluxes and enhanced the heat transfer coefficient. Three flow regimes were observed: Bubbly flow with nucleate boiling heat transfer mechanism, confined bubbly/churn flow with backflow and finally churn flow at high heat fluxes. (C) 2010 Elsevier Masson SAS. All rights reserved.

引用

页码：1183 / 1192

页数：10

共 38 条

[1] Ion track membranes providing heat pipe surfaces with capillary structures [J].