Experimental Study of Non-Symmetry Micro Channel Flat Plate Pulsating Heat Pipe Under Variable Conditions

doi:10.12141/j.issn.1000-565X.220771

Abstract

Abstract:

In order to solve the problem of efficient heat dissipation of miniaturized electronic devices and the difficulty of horizontal operation of pulsating heat pipe, this study designed a non-symmetry micro-channel flat plate pulsating heat pipe (NCPHP) and built an experimental platform for its heat transfer performance. By controlling different incline angles, filling rate and cooling water temperature, the operation characteristics of NCPHP were investigated under the structure design of non-symmetry channel. The results show that the thermal resistance of NCPHP is sensitive to the change of incline angle at 30% and 50% filling rate, and the dry-out phenomenon of NCPHP is observed at 30% filling rate. At 50% filling rate, the thermal resistance of NCPHP can be as low as 0.622 and 0.545 K/W when incline angle is -5° and 0°, respectively. The minimum thermal resistance of NCPHP was 0.415 K/W when the incline angle is 60° and the filling rate is 50%. When the incline angle is -5° and the liquid filling rate is 50%, and the heating power reaches 40 W, the temperature in the evaporation section of NCPHP continues to rise in a short time, but this phenomenon disappears and changes into a stable and fluctuating characteristic when the heating power reaches 50 W. The influence of cooling water temperature on the average temperature difference in the evaporation section of NCPHP decreases with the increase of heating power. At 50% liquid filling rate, the temperature difference of NCPHP evaporation section decreases from 5.1 ℃ at 30 W to 4.2 ℃ at 60 W. Lower cooling water temperature can delay the dry-out phenomenon of 30% liquid filling rate.

Key words: heat transfer, non-symmetry micro-channel, negative incline angle, pulsating heat pipe

CLC Number:

TK174.2

ZHANG Dong, XU Baorui, WANG Sen, et al. Experimental Study of Non-Symmetry Micro Channel Flat Plate Pulsating Heat Pipe Under Variable Conditions[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(8): 51-61.

Figures/Tables 12

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Fig.5

Table 2

Table 3

Fig.6

Fig.7

Fig.8

Fig.9

References 24

1	FENG J H， YU K ．Moore’s law and price trends of digital products：the case of smartphones ［J］．Economics of Innovation and New Technology，2020，29（4）：349-368.
2	王振章，刁兆坤．“双碳”战略下的5G全生命周期网络节能研究［J］．通信世界，2022（11）：44-46.
	WANG Zhenzhang， DIAO Zhaokun ．Research on energy saving of 5G full life cycle network under the “carbon peaking and carbon neutrality” strategy ［J］．Communications World，2022（11）：44-46.
3	JANG D S， KIM D， HONG S H，et al ．Comparative thermal performance evaluation between ultra thin flat plate pulsating heat pipe and graphite sheet for mobile electronic devices at various operating conditions ［J］．Applied Thermal Engineering，2019，149（12）：1427-1434.
4	AKACHI H ．Structure of a heat pipe：US 4921047［P］．1990-05-01.
5	张东，侯宏艺，李庆亮，等．非均匀热流密度条件下脉动热管运行特性分析［J］．华南理工大学学报（自然科学版），2022，50（7）：126-135.
	ZHANG Dong， HOU Hongyi， LI Qingliang，et al ．Analysis of operation characteristics of pulsating heat pipe under the condition of non-uniform heat flux ［J］．Journal of South China University of Technology（Natural Science Edition），2022，50（7）：126-135.
6	BARBA M， BRUCE R， BOUCHET F，et al ．Effects of filling ratio of a long cryogenic pulsating heat pipe［J］．Applied Thermal Engineering，2021，194（11）：117072/1-11.
7	史维秀，郭浩然，陈红迪，等．脉动热管水平及小倾角条件下的传热性能［J］．热能动力工程，2022，37（4）：71-78.
	SHI Wei-xiu， GUO Hao-ran， CHEN Hong-di，et al ．Heat transfer performance of pulsating heat pipe in horizontal position and small inclination angle［J］．Journal of Engineering for Thermal Energy and Power，2022，37（4）：71-78.
8	SUN C H， TSENG C Y， YANG K S，et al ．Investigation of the evacuation pressure on the performance of pulsating heat pipe［J］．International Communications in Heat and Mass Transfer，2017，85（4）：23-28.
9	LI Sizhuo， SUN Xiao， LIU Dongli，et al ．Experimental study on a hydrogen pulsating heat pipe in different heating modes ［J］．Cryogenics，2022，123（10）：103440/1-9.
10	KIM S J， ZHANG Yuwen， CHOI J W ．Effects of fluctuations of heating and cooling section temperatures on performance of a pulsating heat pipe ［J］．Applied Thermal Engineering，2013，58（3）：42-51.
11	王迅，肖冲，李月月．甲醇、丙酮及其二元混合工质脉动热管的启动特性［J］．化工进展，2016，35（9）：2678-2684.
	WANG Xun， XIAO Chong， LI Yueyue ．Experimental study on the start-up characteristic of pulsating heat pipe with methanol/acetone and binary mixed working fluids［J］．Chemical Industry and Engineering Progress，2016，35（9）：2678-2684.
12	张超，徐荣吉，陈静妍，等．非共沸不互溶混合工质脉动热管启动特性分析［J］．化工进展，2019，38（12）：5279-5286.
	ZHANG Chao， XU Rongji， CHEN Jingyan，et al ．Analysis of start-up characteristics of pulsating heat pipe with zeotropic immiscible mixtures ［J］．Chemical Industry and Engineering Progress，2019，38（12）：5279-5286.
13	崔文宇，蒋振，郝婷婷，等．液态金属微液滴脉动热管的传热性能［J］．化工进展，2022，41（1）：95-103.
	CUI Wenyu， JIANG Zhen， HAO Tingting，et al ．Heat transfer performance of oscillating heat pipe with micro-nano droplets of liquid metal ［J］．Chemical Industry and Engineering Progress，2022，41（1）：95-103.
14	张苗，杨洪海，尹勇，等．氧化石墨烯/水脉动热管的启动及传热特性［J］．化工学报，2022，73（3）：1136-1146.
	ZHANG Miao， YANG Honghai， YIN Yong，et al ．Start-up and heat transfer characteristics of a pulsating heat pipe with graphene oxide nanofluids ［J］．CIESC Journal，2022，73（3）：1136-1146.
15	AYEL V， SLOBODENIUK M， BERTOSSI R，et al ．Thermal performances of a flat-plate pulsating heat pipe tested with water，aqueous mixtures and surfactants［J］．International Journal of Thermal Sciences，2022，178（10）：107599/1-15.
16	LIU Shi， LI Jingtao， DONG Xiangyuan，et al ．Experimental study of flow patterns and improved configurations for pulsating heat pipes［J］．Journal of Thermal Science，2007，16（1）：56-62.
17	CHIEN K H， LIN Y T， CHEN Y R，et al ．A novel design of pulsating heat pipe with fewer turns applicable to all orientations［J］．International Journal of Heat and Mass Transfer，2012，55（5）：5722-5728.
18	MARKAL B， CANDERE A C， AVCI M，et al ．Investigation of flat plate type pulsating heat pipes via flow visualization-assisted experiments：Effect of cross sectional ratio ［J］．International Communications in Heat and Mass Transfer，2021，125（10）：105289/1-16.
19	KWON G H， KIM S J ．Operational characteristics of pulsating heat pipes with a dual-diameter tube ［J］．International Journal of Heat and Mass Transfer，2014，75（3）：184-195.
20	JANG D S， LEE J S， AHN J H，et al ．Flow patterns and heat transfer characteristics of flat plate pulsating heat pipes with various asymmetric and aspect ratios of the channels ［J］．Applied Thermal Engineering，2017，114（11）：211-220.
21	KATPRADIT T， WONGRATANAPHISAN T， TERDTOON P，et al ．Correlation to predict heat transfer characteristics of a closed end oscillating heat pipe at critical state ［J］．Applied Thermal Engineering，2005，25（14）：2138-2151.
22	ALBERTO M， KWAME K F， JASON C C，et al ．Numerical investigation of flow instability and heat transfer characteristics inside pulsating heat pipes with different numbers of turns ［J］．International Journal of Heat and Mass Transfer，2021，169（4）：120934/1-18.
23	GÜRSEL G， FRIJNS A J H， HOMBURG F G A，et al ．A mass-spring-damper model of a pulsating heat pipe with a non-uniform and asymmetric filling［J］．Applied Thermal Engineering，2015，91（6）：80-90.
24	傅烈虎．脉动热管的力学分析［J］．制冷，2008，27（4）：6-11.
	FU Liehu ．Mechanical analysis of pulsating heat pipe［J］．Refrigeration，2008，27（4）：6-11.

仪器名称	型号	量程范围	精度
直流电源	UTP1306S	0~32 V	≤0.1%
加热棒	36 V-80 W	0~80 W
T型热电偶	TT-T-36	最大150 ℃	0.1 ℃
蠕动泵	F01A-STP-B103	5~88 mL/min	0.01mL
浮子流量计	LZB-3WB	6~60 mL/min	0.5 mL/min
恒温水浴	XHDC-0510	0~100 ℃	0.1 ℃
数据采集仪	DAQ970A	-100~400 ℃	0.003%
数字真空表	VMV-1	0~10 kPa	读数±5%
旋转真空泵	PCV-2M6

充液率/%	实验工况
充液率/%	α=-10°	α=-5°	α=0°（水平）	α=30°	α=60°	α=90°（竖直）
30	√	√	√	√	√	√
50	√	√	√	√	√	√
70	√	√	√	√	√	√

功率/W	电压/V	电流/A	功率/W	电压/V	电流/A
10	12.9	0.78	40	25.8	1.55
20	18.3	1.11	50	28.7	1.74
30	22.3	1.35	60	31.7	1.89

[1]	WANG Zhenmin, XIE Huimin, LI Xuyan, et al.. Design and Optimization of Liner TIG Welding Gun for Nuclear Heat Transfer Tube with Small Diameter [J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(7): 1-11.
[2]	ZHOU Linren, LI Shaoji, CHEN Lan. Experimental Investigation into Effect of Surface Roughness on Convective Heat Transfer of Concrete [J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(7): 81-89.
[3]	GAN Yunhua, LIAO Yuepeng, YUAN Hui, et al. Experimental Study on Heat Transfer Performance of Separated Heat Pipe Heat Exchanger in Communication Base Station [J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(6): 109-118.
[4]	XIE Zhihui, LIU Hanyu, WU Jiechang, et al. Numerical Analysis with Thermal-Magnetic-Fluid Coupling on Enhanced Heat Transfer for Shell-and-Tube Heat Exchanger [J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(3): 22-32.
[5]	GAN Yunhua, LIU Runxi, YUAN Hui, et al. Performance Analysis of Integrated Micro-Channel Heat Exchanger [J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(3): 13-21.
[6]	ZHANG Dong, HOU Hongyi, LI Qingliang, et al. Analysis of Operation Characteristics of Pulsating Heat Pipe Under the Condition of Non-uniform Heat Flux [J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(7): 126-135.
[7]	CHEN Yuanlong, LIN Hua, CHEN Peixuan, et al. Multiphysics Coupling Simulation of ECM Temperature Based on Different Turbulence Models [J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(3): 88-94,126.
[8]	YANG Chen, WANG Fenglei, WU Jiayi, et al. Analysis of Shell-Side Thermal-Hydraulic Performance of Hybrid Smooth and Spirally Corrugated Tubes [J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(2): 137-144.
[9]	WEI Xiaolan, LIN Guoqing, DING Jing, et al. Simulation and Experiment Investigation into Specific Heat Capacity Enhancement of Nitrate Molten Salt Nanofluid [J]. Journal of South China University of Technology (Natural Science Edition), 2021, 49(9): 46-55.
[10]	YANG Song, LI Wenqiang, HUANG Xu, et al. Study on Temperature Field of Steel Box Girder Based on Modified Convective Heat Transfer Coefficient [J]. Journal of South China University of Technology(Natural Science Edition), 2021, 49(4): 47-58,64.
[11]	HE Boshu, YING Zhaoping, SU Liangbin, et al. Numerical Investigation of Heat Transfer Performance of Molten Salt-Based Nanofluids for Internal Flow#br# [J]. Journal of South China University of Technology (Natural Science Edition), 2021, 49(2): 33-39.
[12]	YIN Shugui GUO Weike HUANG Dong ZHANG Huawei WU Houji ZHANG Chunhua. Simulation Study on Heat Transfer Characteristics and Cooling water Design for the Casting Film [J]. Journal of South China University of Technology(Natural Science Edition), 2021, 49(12): 23-34.
[13]	YAO Yuan, CHEN Ying, CHEN Jianyong, et al. Experimental Study on Enhanced Heat Transfer Characteristics of Plate Condenser with Liquid-Vapor Separation [J]. Journal of South China University of Technology (Natural Science Edition), 2021, 49(10): 114-122.
[14]	YU Xiaodong, GAO Weicheng, WU Guangpeng, et al. Thermal Performance Characterization of Hydrostatic Thrust Bearing Under High Speed and Heavy Load Working Conditions [J]. Journal of South China University of Technology (Natural Science Edition), 2020, 48(9): 79-85.
[15]	LI Yong, XU Peiken, YANG Shifan, et al. Thermal Performance of Ｒoll Bond Aluminum Vapor Chamber [J]. Journal of South China University of Technology (Natural Science Edition), 2020, 48(2): 34-41.