Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure

Md. Lutfor Rahman; Md. Faisal Kader; Md. Zakaria Rahman; M. Ali

doi:10.12691/ajme-4-6-1

American Journal of Mechanical Engineering

Vol. 4, No. 6, 2016, pp 209-214. doi: 10.12691/ajme-4-6-1 | Research Article

OPEN ACCESS

PEER-REVIEWED

Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure

Md. Lutfor Rahman^1,, Md. Faisal Kader¹, Md. Zakaria Rahman¹, M. Ali¹

¹Department of Mechanical Engineering, Military Institute of Science and Technology (MIST), Mirpur Cantonment, Dhaka, BANGLADESH

	Abstract
1.	Introduction
2.	Experimental Setup
3.	Results and Discussion
4.	Conclusion
	References

Abstract

Pulsating Heat Pipe (PHP) is a new and emerging cooling technique in the field of thermal management especially in microelectronics. To fulfill the increasing demand of power electronic applications, PHP is a proven technology which works on principle of self-oscillation of the working fluid and phase change heat transfer phenomenon in a capillary tube. In this paper, the thermal performance of a closed loop pulsating heat pipe (CLPHP) without fin and with fin at the condenser section by using Acetone and Water as working fluid has been investigated experimentally. The effects of different parameters include the filling ratios (from 40% to 70% in steps of 10%), the inclination angles ( 0°, 30°, 45°, and 60°), and at various heat input (10 to 10W in the steps of 10W) has been investigated thoroughly. In this study CLPHP is made from long capillary copper tube with inner diameter of 2.0 mm and outer diameter of 3.0 mm. The heat pipe is bent into eighth number of U-turns and divided into three sections, evaporator section (50 mm), adiabatic section (120 mm) and condenser section (80 mm). Adiabatic section is maintained by using aluminum foil surrounded by appropriate insulation. The result shows that, the thermal resistance decreases as heat input increases. But at low heat input i.e. up to 60W, the thermal resistance decreases rapidly and the PHP performance is more sensitive to the inclination angle whereas high heat input i.e. above 60W, the thermal resistance decreases slowly and comparatively less independent to the inclination angle. Evaporator dry out is occurred for acetone at low filling ratio with 40% and 50% at heat input 40W and 50 W respectively. CLPHP with fin structure shows better performance than the CHPHP without fin structure at high heat input. Acetone with 70% filling ratio and water with 50% filling ratio shows the best performance at 0° inclination angle for both structures.

Keywords: PHP, CLPHP, working fluid, filling ratio, inclination angle, thermal resistance, fin structure and without fin structure.

Cite this article:

Md. Lutfor Rahman, Md. Faisal Kader, Md. Zakaria Rahman, M. Ali. Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure. American Journal of Mechanical Engineering. Vol. 4, No. 6, 2016, pp 209-214. https://pubs.sciepub.com/ajme/4/6/1

Rahman, Md. Lutfor, et al. "Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure." American Journal of Mechanical Engineering 4.6 (2016): 209-214.

Rahman, M. L. , Kader, M. F. , Rahman, M. Z. , & Ali, M. (2016). Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure. American Journal of Mechanical Engineering, 4(6), 209-214.

Rahman, Md. Lutfor, Md. Faisal Kader, Md. Zakaria Rahman, and M. Ali. "Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure." American Journal of Mechanical Engineering 4, no. 6 (2016): 209-214.

Import into BibTeX

Import into EndNote

Import into RefMan

Import into RefWorks

At a glance: Figures

View all figures

123456

Prev Next

1. Introduction

Advancement is taking place in thermo-fluid engineering due to increasing demand of smaller and effective heat transfer devices. This leads to the development of Pulsating Heat Pipe (PHP), which is a self-oscillating two-phase heat transfer device for handling moderate to high heat fluxes typically suited for cooling of electronic devices, power electronics, energy saving technology and other similar applications. Due to its excellent features, PHP has been considered as one of the promising technologies for electronic cooling, heat exchanger, etc.

PHP is a passive two-phase heat transfer device which is first introduced by G. F. Smyrnov and G. A. Savchenkov (USSR patent 504065) in 1971 ^[1]. This PHP was based on wickless system which able to operate against gravity and incorporated his invention in refrigeration systems. Although the fundamental aspect of a PHP is contained in their patent, the exploitation of the concept from an engineering point of view was done by H. Akachi in 1990 ^[2]. In this Patent, (US patent 4921041) he described twenty four different loop type heat pipes.

The PHPs can be generally classified into two major categories such as closed loop pulsating heat pipe (CLPHP) and open loop pulsating heat pipe (OLPHP). The performance of PHP has been widely investigated by scientists and engineers all over the world for its excellent features such as small volume, low fabricating cost, simple structure and high heat transfer performance. The performance of a PHP depends upon many factors like the geometrical parameters of flow channel, the working fluid, filling ratio, number of turns, inclination angle and PHP configurations ^{[3, 4]}.

Over the years, many experimental studies have been conducted to understand the mechanism of heat transfer characteristics in PHP and the factors affecting the performance of PHP. The most of the researchers have conducted experiment mainly focused on PHP with open loop ^{[2, 3, 5, 6, 7]}, closed loop PHP with check valve ^{[2, 8, 9, 10, 11]} and closed loop PHP [2,6,7,12-19]. It has been shown by the previous studies that a CLPHP is thermally more advantageous than an OLPHP because of the possibility of fluid circulation. Although a certain number of check valves has shown to improve the performance, miniaturization of the device makes it difficult and expensive to install such valve. Therefore, a CLPHP without any check valve is most favorable from many practical aspects. The most of the previous experimental studies mainly focused on the factors affecting the performance of PHP like the effects of inner diameter, number of turns, working fluids, filling ratio, operational orientation, aspect ratio, heating mode, heat load and its limitation in the form of evaporator dry-out. To enhance the heat transfer characteristics in CLPHP, fins in the condenser section can be adopted and investigated. The purpose of the present study is to explore the insight physics of heat transfer mechanism, thermal performances of CLPHP through experimental investigation using fins at the condenser section.

Download as

[1]	G. F. Smyrnov and G. A. Savchenkov, (USSR Patent 504065), 1971.
	In article

[2]	H. Akachi, Structure of a Heat Pipe, U.S. Patent Number 4921041, 1990.
	In article

[3]	H. Akachi, F. Polasek and P. Stulc, Pulsating Heat Pipes, Proc.5th International Heat Pipe Symposium, pp. 208-217, Melbourne, Australia, 1996.
	In article

[4]	Y. Zhang and A. Faghri, Advances and Unsolved Issues in Pulsating Heat Pipes, Copyright Taylor and Francis Group, LLC, Heat Transfer Engineering, 29(1):20-44, 2008.
	In article	View Article

[5]	S. Maezawa, R. Nakajima, Gi K. and H. Akachi, Cooling of note book PC by Oscillating Heat Pipe, in: 10th Int. Heat Pipe Conf., Vol. 3/4, Session F, Stuttgart, Germany, 1997.
	In article

[6]	M. B. Shafii, A. Faghri and Y. Zhang, Thermal Modeling of Un looped and Looped Pulsating Heat Pipes, ASME Journal of Heat Transfer, Vol. 123, No. 6, pp. 1159-1172, 2001.
	In article	View Article

[7]	Zhang X. M., Xu, J. L., and Zhou, Z. Q., Experimental Study of a Pulsating Heat Pipe using FC-72, Ethanol, and Water as Working Fluids, Experimental Heat Transfer, vol. 17, no. 1, pp. 47-67, 2004.
	In article	View Article

[8]	P. Meena, S. Rittidech and P. Tammasaeng , Effect of Inner Diameter and Inclination Angles on Operation Limit of Closed-Loop Oscillating Heat-Pipes with Check Valves, American Jernal of Engineering and Applied Sciences, Vol. 1 (2), pp. 100-103, 2008.
	In article	View Article

[9]	P. Meena and S. Rittidech, Comparisons of heat transform performance of a CLOHP and CLOHP with Check Valves heat exchangers, American Journal of Applied Sciences 1(1): 7-11, 2008, ISSN 1941-7020.
	In article

[10]	S. Rittidech P. Meena and P. Terdtoon, Effect of Evaporator Lengths and Ratio of Check Valves to Number of Turns on Internal Flow Patterns of a Closed–Loop Oscillating Heat-Pipe With Check Valves , American Journal of Applied Sciences 5 (3): 184-188, 2008.
	In article	View Article

[11]	P. Meena, S. Rittidech and P. Tammasaeng, Effect of Evaporator Section Lengths and Working Fluids on Operational Limit of Closed Loop Oscillating Heat Pipes with Check Valves (CLOHP/CV), American Journal of Applied Sciences, Vol.6(1), pp.133-136, ISSN 1546-9239, 2009.
	In article

[12]	P. Charoensawan, S. Khandekar, Manfred Groll, and P. Terdtoon, Closed Loop Pulsating Heat Pipes, Part A: parametric experimental investigations, Applied Thermal Engineering, Vol. 23, No.16, pp. 2009-2020, 2003.
	In article	View Article

[13]	S. Khandekar, N. Dollinger and M. Groll, Understanding Operational Regimes of Closed Loop Pulsating Heat Pipes: An Experimental Study, Applied Thermal Engineering, Vol.23, No.6, pp.707-719, 2003.
	In article	View Article

[14]	Honghai Yang, S. Khandekar, M. Groll, Operational limit of Closed Loop Pulsating Heat Pipes, Applied Thermal Engineering, Vol.28 , pp.49-59, 2008.
	In article	View Article

[15]	N. Panyoyai, P. Terdtoon and P. Sakulchangsatjatai, Effects of Aspect Ratios and Number of Meandering Turns on Performance Limit of an Inclined Closed-Loop Oscillating Heat Pipe, Energy Research Journal, Vol. 1 (2), pp. 91-95, 2010.
	In article	View Article

[16]	Dharmapal A Baitule1 and Pramod R Pachghare, Experimental analysis of closed loop pulsating heat pipe with variable filling ratio, Int. J. Mech. Eng. & Rob. Res. ISSN 2278-0149 www. ijmerr.com, Vol. 2, No. 3, July 2013.
	In article

[17]	Bhawna Verma, Vijay Lakshmi Yadav and Kaushal Kumar Srivastava, Experimental Studies on Thermal Performance of a Pulsating Heat Pipe with Methanol/DI Water, Journal of Electronics Cooling and Thermal Control, pp 27-34, 3 March 2013.
	In article	View Article

[18]	R. Naik , V. Varadarajan , G. Pundarika and K. R. Narasimha, Experimental Investigation and Performance Evaluation of a Closed Loop Pulsating Heat Pipe, Journal of Applied Fluid Mechanics, Vol. 6, No. 2, pp. 267-275, 2013.
	In article

[19]	E. R. Babu and G. V. Gnanendra Reddy, Effect of working fluid and filling ratio on performance of a closed loop pulsating heat pipe, Journal of Engineering Science and Technology Vol. 11, No. 6 (2016) 872-880 © School of Engineering, Taylor’s University.
	In article

[20]	ANSI/ASME, Measurement Uncertainty, Report PTC 19.1-(1985, 1986).
	In article

Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin a...

Experimental Investigation on Thermal Performance of a Closed Loop Pulsating Heat Pipe without Fin and with Fin Structure

Abstract

Cite this article:

At a glance: Figures

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

1. Introduction

2. Experimental Setup

3. Results and Discussion

4. Conclusion

References

Pages

Partners

Help & Contacts

Follow Us