圆柱形环状脉动热管烧干特性

doi:10.16085/j.issn.1000-6613.2022-2232

摘要/Abstract

摘要：

当前各个领域对高效、高均温性的散热需求日益提高，脉动热管以其传热效率优异、加热方式灵活、结构简单等优势，成为合适、有效的散热元件。本文提出并设计了一种圆柱形环状脉动热管，并通过实验研究了圆柱形环状脉动热管的烧干特性。实验选用无水乙醇、HFE-7200为工质，在90°倾角条件下，对30%、70%充液率的脉动热管进行了加热功率为100~200W的实验测试；在30%充液率条件下，对30°、45°、70°安装角度的脉动热管进行了加热功率为20~100W的实验测试，研究了圆柱形环状脉动热管在不同弯头处的烧干特性。研究结果表明：倾角越大，圆柱形环状脉动热管在弯头处达到烧干时所需要的加热功率越大。当工质为HFE-7200，倾角分别为30°、45°、70°时，圆柱形环状脉动热管4个弯头处发生烧干状态的功率均为100W。

关键词: 圆柱形环状脉动热管, 倾角, 加热功率, 充液率, 烧干特性

Abstract:

At present, the heat dissipation demand for high efficiency and high temperature uniformity is increasing in various fields. Pulsating heat pipe has become a suitable and effective heat dissipation element due to its excellent heat transfer efficiency, flexible heating mode, simple structure and other advantages. In this paper, a cylindrical annular pulsating heat pipe was proposed and designed, and the drying characteristics of the cylindrical annular pulsating heat pipe were studied experimentally. In the experiment, anhydrous ethanol and HFE-7200 were used as working medium. Under the condition of 90° dip angle, the heating power of 100—200W was tested for the pulsating heat pipe with 30% and 70% liquid filling rate. Under the condition of 30% liquid filling rate, the heating power of the pulsating heat pipe at 30°, 45° and 70° was measured at 20—100W. The drying characteristics of cylindrical annular pulsating heat pipe at different elbows were studied. The results showed that the higher the dip angle, the higher the drying power of the cylindrical annular pulsating heat pipe. When the working medium was HFE-7200 and the dip angles were 30°, 45° and 70°, respectively, the powers of the four elbows of the cylindrical annular pulsating heat pipe were all 100W.

Key words: cylindrical annular pulsating heat pipe, inclination angle, heating power, liquid filling rate, drying characteristics

中图分类号:

TK 124

惠博, 侯宏艺, 张涛, 车生文. 圆柱形环状脉动热管烧干特性[J]. 化工进展, 2023, 42(S1): 33-40.

HUI Bo, HOU Hongyi, ZHANG Tao, CHE Shengwen. Drying characteristics of cylindrical annular pulsating heat pipe[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 33-40.

图/表 11

图1 圆柱形环状脉动热管实验平台

图2 脉动热管结构示意图

图3 脉动热管内外铜环结构示意图（单位：mm）

图4 四个弯头的温度测量点示意图

图5 可任意旋转固定支架装置

表1 实验装置被测量物理量、工作范围及精度

测量物理量	采用测量方式	仪器型号	工作范围	仪器精度
铜管表面温度	铂热电阻	PT100	-5~650℃	±0.2℃
管内压力	压力传感器	UNF/7/16	0.1~1MPa	0.5%FS
加热功率	直流稳压电源	UTP1306S	0~32V，0~6A	≤0.1%+10mV，≤0.2%+3mA
冷却水流量	转子流量计	LZB-6	6~60L/h	4级

表2 工质物性参数表

物性	单位	无水乙醇	HFE-7200
沸点	℃	78.24	76
密度	g/cm³	0.785	1.42
表面张力	mN/m	21.97	13.6
黏度	Pa·s	1.0817	0.61
汽化潜热	kJ/kg	920.66	119
热导率	W/(m·K)	0.163	0.0555(饱和蒸汽)
比热	J/(kg·K)	2434.6	1220

图6 工质为无水乙醇，不同充液率下热管弯头处的烧干情况

图7 HFE-7200为工质、不同充液率下热管的弯头烧干情况

图8 无水乙醇为工质，不同倾角下热管的弯头烧干情况

图9 HFE-7200为工质，不同倾角下热管的弯头烧干情况

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