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Experimental Investigation of Flat Plate Cryogenic Oscillating Heat Pipe

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Abstract

Recent developments in applications such as high-temperature superconducting magnets, infrared detectors, and electronics components have led to an alarming increase in heat dissipation rate, which now far exceeds the capability of conventional heat pipe cooling systems. This trend is responsible for a recent transition to flat plate oscillating heat pipes. A new flat plate cryogenic oscillating heat pipe (FPC-OHP) has been developed and validated through experimentations. The performance evaluation of FPC-OHP was investigated with temperature measurements. FPC-OHP consisted of evaporator, condenser, and adiabatic section with the dimensions of 93 × 70 × 8 mm3. The FPC-OHP was made of copper alloy and fabricated by a vertical milling machine, having square channels with a hydraulic radius of 0.66 mm. Liquid nitrogen was used as a working fluid with a charge ratio of 60%. Experimental results revealed the maximum heat transport capability up to 300 W. Moreover, the thermal resistance decreased from 0.25 to 0.11 K/W corresponding to an increase in the heat load from 25 to 300 W. The average temperature difference between evaporator section and condenser section reached up to 34 K for 300 W. The measured effective thermal conductivities were found to be 7353 W/m K.

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Abbreviations

Bo:

Bond number

g :

Gravitational force (m/s2)

\( \sigma_{\text{v}} \) :

Liquid density (kg/m3)

\( \sigma_{\text{l}} \) :

Vapor density (kg/m3)

\( r_{\text{h}} \) :

Hydraulic radius (mm)

\( \sigma \) :

Surface tension (kg/s2)

Q :

Heat load (W)

R th :

Thermal resistance (K/W)

U :

Internal energy (J)

T :

Temperature (°C)

e:

Evaporator

c:

Condenser

l:

Liquid

v:

Vapor

FP-OHP:

Flat plate oscillating heat pipe

FPC-OHP:

Flat plate cryogenic oscillating heat pipe

K e :

Effective thermal conductivity

W:

Watt

D :

Distance of the two centers of the evaporator and condenser

A :

Total cross-sectional area of FP-OHP

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Acknowledgements

This project has been supported by the Gujarat Technological University (Grant No. 201921003211) under student startup and innovation Policy (SSIP).

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Authors and Affiliations

  1. Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India

    Vivek Patel

  2. Government College of Engineering, Dahod, Gujarat, India

    Nirvesh Mehta

  3. Department of Mechanical Engineering, Gujarat Technological University, Ahmedabad, Gujarat, India

    Kamlesh Mehta

  4. Navrachana University, Vadodara, Gujarat, India

    Amarish Badgujar

  5. Lalbhai Dalpatbhai College of Engineering, Ahmedabad, Gujarat, India

    Shreya Mehta

  6. Government College of Engineering, Modasa, Gujarat, India

    Nisha Bora

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  1. Vivek Patel
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Correspondence to Kamlesh Mehta.

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Patel, V., Mehta, N., Mehta, K. et al. Experimental Investigation of Flat Plate Cryogenic Oscillating Heat Pipe. J Low Temp Phys 198, 41–55 (2020). https://doi.org/10.1007/s10909-019-02243-1

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