Experimental Investigation of Fluid Motion in Pulsating Heat Pipe

2015 ◽  
Author(s):  
Hyung Yun Noh ◽  
Sung Jin Kim
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Latent Heat ◽  
High Speed ◽  
Fluid Motion ◽  
Pulsating Heat Pipe ◽  
Operating Characteristics ◽  
Two Phase ◽  
Saturation State ◽  
Circulation Mode

In this research, operating characteristics and heat transfer phenomena in 2-turn pulsating heat pipe operating in a circulation mode were experimentally investigated. Temperature, pressure and high-speed flow visualization data were obtained with the variation of diameters (1.2 mm, 1.7 mm and 2.2 mm) and input powers. The overall pressure variation from start-up to steady state was measured using the pressure transmitters in the evaporator section. Heat transfer phenomena were investigated using homogeneous-equilibrium model. Thermodynamic state of two-phase mixture at the exit of evaporator is identified as a saturation state using obtained temperature and pressure data. The ratio of sensible heat to latent heat changed with the variation of diameters and input powers. It was found that each evaporator has a different ratio and latent heat was dominant in most experimental cases.

scholarly journals A Dynamic Film Model of the Pulsating Heat Pipe

2011 ◽  
Vol 133 (8) ◽  
Author(s):  
Vadim S. Nikolayev
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Capillary Tube ◽  
Numerical Code ◽  
Oscillating Flow ◽  
Pulsating Heat Pipe ◽  
Two Phase ◽  
Thermally Induced ◽  
Film Evaporation ◽  
Condensation Model

This article deals with the numerical modeling of the pulsating heat pipe (PHP) and is based on the film evaporation/condensation model recently applied to the single-bubble PHP (Das et al., 2010, “Thermally Induced Two-Phase Oscillating Flow Inside a Capillary Tube,” Int. J. Heat Mass Transfer, 53(19–20), pp. 3905–3913). The described numerical code can treat the PHP of an arbitrary number of bubbles and branches. Several phenomena that occur inside the PHP are taken into account: coalescence of liquid plugs, film junction or rupture, etc. The model reproduces some of the experimentally observed regimes of functioning of the PHP such as chaotic or intermittent oscillations of large amplitudes. Some results on the PHP heat transfer are discussed.

Mechanisms of Coupled Heat Transfer and Flow of High Heat Flux Pulsating Heat Pipe

2004 ◽  
Author(s):  
Wei Qu ◽  
Yantao Qu ◽  
Tongze Ma
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Pipe ◽  
Latent Heat ◽  
High Heat ◽  
High Heat Flux ◽  
Sensible Heat ◽  
Pulsating Heat Pipe ◽  
Coupled Heat Transfer ◽  
Heating Section

The mechanisms of coupled heat transfer and flow are modeled to describe the looped pulsating heat pipe of high heat flux. The latent heat transfer produces the pressure difference between the heating section and cooling section. This can provide the operational driving force to overcome the total flow resistances. While the sensible heat transfer contributes more to the transferred power. The results demonstrate that the circulation flow velocity can balance the heat and mass transfers automatically. And the ratio of latent heat transfer to sensible heat transfer is within 30 percent.

Experimental Study on Heat Transfer Characteristic of Plate Pulsating Heat Pipe

2009 ◽  
Author(s):  
Li Quan ◽  
Li Jia
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Cross Section ◽  
Heat Pipes ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Pulsating Heat Pipe ◽  
Operating Characteristics ◽  
Cross Sectional ◽  
Start Up

An experimental system of flat plate pulsating heat pipe was established and experimental research was carried out in this system to understand the mechanism of heat transfer and operating characteristics. The effects of start-up time, operating characteristics, and structures of passage, incline angle, fill ratio and working fluid on plate pulsating heat pipe were discussed. The results indicate that temperature of heating section decreases and the temperature of cooling section increases, then the thermal resistant of PHP is decreased once the plate pulsating heat pipe starts to work. Different start-up powers are needed for different fill ratios and incline angles. The inter pressure of PHP has some impacts on the start-up and operation of PHP. The pulsating heat pipes with different structures have different heat transfer performance. Increasing cross-sectional area and the number of turnings of the heat pipe can improve the heat transfer characteristics of heat pipes. Cross-section shape was also an important influencing factor. With the same cross-sectional area, heat pipe with triangular cross-section of the inner tubes gives better performance than that with rectangular cross-section.

scholarly journals MAJOR TEN PARAMETERS OF PULSATING HEAT PIPE- A REVIEW

2021 ◽  
Vol 9 (2) ◽  
pp. 1134-1138
Author(s):  
Bukke Nagamuni Naik, Et. al.
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Electronic Device ◽  
Pulsating Heat Pipe ◽  
Heat Management ◽  
Two Phase ◽  
Space Applications ◽  
Working Principle ◽  
Solar Heater ◽  
Modern Era

Thermal Management in the present issue in the modern era. The technology in heat transfer day by day is increased gradually especially in electronic device, space applications, hybrid vehicles, solar heater. These are the major areas where heat management are successfully research is going on Pulsating Heat Pipe is a two phase device where the heat transfer is takes place through sensible and latent heat. This paper gives an over review of the Pulsating heat pipe design, working principle, parameters which   effects the PHP, dryout condition and applications where PHP is used successfully research is going on. This paper addresses the fundamentals of PHP, an overview, and the applications of PHP.

HEAT TRANSFER STUDIES IN A CLOSED LOOP PULSATING HEAT PIPE

2014 ◽  
Vol 5 (1-4) ◽  
pp. 449-456
Author(s):  
Bhawna Verma ◽  
V. L. Yadav ◽  
K. K. Srivastava
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Closed Loop ◽  
Pulsating Heat Pipe
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