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Effect of foldability on the start-up behavior and thermal performance of flexible pulsating heat pipe

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Abstract

In this Paper, a Flexible Pulsating Heat Pipe (FPHP) was experimentally tested to evaluate the effect of foldability on the start-up, overall thermal resistance and evaporator temperature. Evaporator and condenser sections were made of 9 turn copper capillary of 2 mm inner diameter. Adiabatic section was made of a silicon rubber tube with an inner diameter of 3 mm. Deionized water with 50% filling ratio was used as working fluid. Heating power range kept was 10–100 W. Four different structural styles (Vertical, 45-Degree, 60-Degree and 90-Degree) created by deforming adiabatic section were experimentally tested and compared. The results show that FPHP showed efficient performance in vertical style. The minimum thermal resistance found is 0.65 °C/W for vertical style when heating power is 99.88 W. Deformation of adiabatic section degrades start-up and thermal performance of FPHP which depends on the deformation extent. The highest increase in thermal resistance for 90-Degree style is 29.30% for the heating power of 99.88 W when compared with vertical style. Start-up heat input observed is 50.52 W for vertical and 45-Degree styles while it is 60.29 W for 60-Degree and 90-Degree styles. Start-up evaporator temperature increases when the structural style is changed from vertical to 90-Degree.

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Abbreviations

R:

Thermal Resistance (°C/W)

T:

Temperature (°C)

Q:

Heating power (W)

V:

Electric voltage (v)

I:

Electric current (A)

e:

Evaporator section

c:

Condenser section

in:

Input

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Funding

This work was supported by the Student Startup and Innovation Policy (SSIP) cell of the Education Department, Government of Gujarat (GKS/SSIP/2019–2020 /SOIC/ Sanction Order/272). Corresponding author (Ankursinh Solanki) has received this financial support from the SSIP cell.

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Authors and Affiliations

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

    Ankursinh Solanki

  2. Department of Mechanical Engineering, L. D. College of Engineering, Ahmedabad, Gujarat, India

    Ragesh G. Kapadia

Authors
  1. Ankursinh Solanki
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  2. Ragesh G. Kapadia
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Contributions

All authors contributed to the study's conception and design. Material preparation, data collection and analysis were performed by Ankursinh Solanki. The first draft of the manuscript was written by Ankursinh Solanki and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ankursinh Solanki.

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Solanki, A., Kapadia, R.G. Effect of foldability on the start-up behavior and thermal performance of flexible pulsating heat pipe. Heat Mass Transfer 59, 439–447 (2023). https://doi.org/10.1007/s00231-022-03273-4

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