H221 Study on the Mechanism of Heat Transport in a Pulsating Heat Pipe by Using a Forced Oscillation System

2013 ◽  
Vol 2013 (0) ◽  
pp. 419-420
Author(s):  
Masayoshi MIURA ◽  
Takao NAGASAKI ◽  
Yutaka ITO
Keyword(s):  
Heat Pipe ◽  
Heat Transport ◽  
Forced Oscillation ◽  
Pulsating Heat Pipe ◽  
Oscillation System

Theoretical Realizability of Dream-Pipe-Like Oscillating/Pulsating Heat Pipe

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Masao Furukawa
Keyword(s):  
Heat Pipe ◽  
Heat Transport ◽  
Capillary Tube ◽  
Feasibility Studies ◽  
Temperature Fields ◽  
Pulsating Heat Pipe ◽  
Long Distance ◽  
Effective Thermal Diffusivity ◽  
Energy Equations ◽  
Adiabatic Section

The state of the art of thermally self-excited oscillatory heat pipe technology is briefly mentioned to emphasize that there exists no oscillating/pulsating heat pipe (OHP/PHP) suited to long-distance heat transport. Responding to such conditions, this study actively proposes a newly devised conceptually novel type of OHP/PHP. In that heat pipe, the adiabatic section works as it were the dream pipe invented by Kurzweg. This striking quality of the proposed new-style OHP/PHP produces high possibilities of long-distance heat transport. To support such optimistic views, an originally planned mathematical model is introduced for feasibility studies. Hydraulic considerations have first been done to understand what conditions are required for sustaining bubble-train flows in a capillary tube of interest. Theoretical analysis has then been made to solve the momentum and energy equations governing the flow velocity and temperature fields in the adiabatic section. The obtained analytical solutions are arranged to give algebraic expressions of the effective thermal diffusivity, the performance index combined with the tidal displacement, and the required electric power. Computed results of those three are displayed in the figures to demonstrate the realizability of that novel OHP.

Study on a Pulsating Heat Pipe With Self-Rewetting Fluid

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Koji Fumoto ◽  
Masahiro Kawaji ◽  
Tsuyoshi Kawanami
Keyword(s):  
Surface Tension ◽  
Heat Pipe ◽  
Heat Transport ◽  
Heated Surface ◽  
Input Power ◽  
Water Mixture ◽  
Pulsating Heat Pipe ◽  
Maximum Heat ◽  
Dry Spot ◽  
Heat Transport Capability

This paper discusses a pulsating heat pipe (PHP) using a self-rewetting fluid. Unlike other common liquids, self-rewetting fluids have the property that the surface tension increases with temperature. The increasing surface tension at a higher temperature can cause the liquid to be drawn toward a heated surface if a dry spot appears and thus to improve boiling heat transfer. In experiments, 1-butanol and 1-pentanol were added to water at a concentration of less than 1 wt % to make self-rewetting fluid. A pulsating heat pipe made from an extruded multiport tube was partially filled with the self-rewetting fluid water mixture and tested for its heat transport capability at different input power levels. The experiments showed that the maximum heat transport capability was enhanced by a factor of 4 when the maximum heater temperature was limited to 110°C. Thus, the use of a self-rewetting fluid in a PHP was shown to be highly effective in improving the heat transport capability of pulsating heat pipes.

scholarly journals Study of a Single, Straight Tube Pulsating Heat Pipe (Oscillation Behavior and Heat Transport Characteristics)

2012 ◽  
Vol 78 (788) ◽  
pp. 881-893 ◽  
Author(s):  
Kunito OKUYAMA ◽  
Satoshi KAMIDOZONO ◽  
Jun IYESHIMA ◽  
Shunske KATO ◽  
Shoji MORI
Keyword(s):  
Heat Pipe ◽  
Heat Transport ◽  
Straight Tube ◽  
Pulsating Heat Pipe

Operating Characteristic Investigations in Pulsating Heat Pipe

2006 ◽  
Vol 128 (12) ◽  
pp. 1329-1334 ◽  
Author(s):  
Qingjun Cai ◽  
Chung-lung Chen ◽  
Julie F. Asfia
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Temperature Difference ◽  
Temperature Fluctuation ◽  
Operating Temperature ◽  
Temperature Fluctuations ◽  
Pulsating Heat Pipe ◽  
Oscillation System ◽  
Evaporator Temperature ◽  
Total Temperature

Pulsating heat pipe (PHP) is an interesting heat transfer device. In this paper we focus on PHP heat transfer characteristics versus its operating temperature. In experiments of copper and stainless steel PHPs, results indicate that, at a same input power, both the total temperature differences (from the evaporator to condenser) and the evaporator temperature fluctuations are relevant to operating temperature. The minimal total temperature difference and temperature fluctuation appear at an operating temperature ranging from 120°Cto160°C. Experimental analysis of the evaporator temperature fluctuations show that single phase cooling in PHP causes a large total temperature difference and temperature fluctuation. Phase change proportion increases at the optimal operating temperature. Static mechanical balance combining with dynamic elastic oscillation system is used to interpret PHP temperature variations versus the operating temperature.

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