Research Papers: Two-Phase Flow and Heat Transfer

Experimental and Analytical Studies of Reciprocating-Mechanism Driven Heat Loops (RMDHLs)

[+] Author and Article Information
Yiding Cao, Mingcong Gao

Department of Mechanical Engineering, Florida International University, Miami, FL 33199

J. Heat Transfer 130(7), 072901 (May 16, 2008) (6 pages) doi:10.1115/1.2909078 History: Received April 16, 2007; Revised August 23, 2007; Published May 16, 2008

This paper conducts experimental and analytical studies of a novel heat-transfer device, reciprocating-mechanism driven heat loop (RMDHL) that facilitates two-phase heat transfer while eliminating the so-called cavitation problem commonly encountered by a conventional pump. A RMDHL normally includes a hollow loop having an interior flow passage, an amount of working fluid filled within the loop, and a reciprocating driver. The hollow loop has an evaporator section, a condenser section, and a liquid reservoir. The reciprocating driver is integrated with the liquid reservoir and facilitates a reciprocating flow of the working fluid within the loop, so that liquid is supplied from the condenser section to the evaporator section under a substantially saturated condition and the so-called cavitation problem associated with a conventional pump is avoided. The reciprocating driver could be a solenoid-operated reciprocating driver for electronics cooling applications and a bellows-type reciprocating driver for high-temperature applications. Experimental study has been undertaken for a solenoid-operated heat loop in connection with high heat flux thermal management applications. Experimental results show that the heat loop worked very effectively and a heat flux as high as 300Wcm2 in the evaporator section could be handled. A working criterion has also been derived, which could provide a guidance for the design of a RMDHL.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 4

Schematic axial cross-sectional view of a bellows-type reciprocating driver

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Figure 3

Schematic of a bellows-type RMDHL

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Figure 2

Schematic of a solenoid driver integrated with the liquid reservoir

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Figure 1

Schematic of a RMDHL

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Figure 5

A photograph of the fabricated RMDHL

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Figure 6

Experimental setup: (1) heater, (2) heat loop, (3) cooling jacket, (4) solenoids, (5) switch, (6) power supply, (7) constant temperature circulator, (8) thermocouples, and (9) data acquisition system

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Figure 7

Comparison of temperature distributions with pump on and off

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Figure 8

Axial temperature distributions (Tc=50°C)

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Figure 9

Axial temperature distributions (Tc=65°C)

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Figure 10

Axial temperature distributions (Tc=40°C)

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Figure 11

The initial state of the heat loop for the derivation of the working criterion

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Figure 12

The final state of the heat loop for the derivation of the working criterion



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