Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Experimental Study on the Heat Transfer Performance of Pump-assisted Capillary Phase-change Loop

Version 1 : Received: 26 October 2021 / Approved: 27 October 2021 / Online: 27 October 2021 (15:11:16 CEST)

A peer-reviewed article of this Preprint also exists.

Yang, X.; Wang, G.; Zhang, C.; Liu, J.; Wei, J. Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop. Appl. Sci. 2021, 11, 10954. Yang, X.; Wang, G.; Zhang, C.; Liu, J.; Wei, J. Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop. Appl. Sci. 2021, 11, 10954.

Journal reference: Appl. Sci. 2021, 11, 10954
DOI: 10.3390/app112210954

Abstract

To overcome the two-phase flow instability of traditional boiling heat dissipation technologies, a porous wick was used for liquid-vapor isolation, thus realizing efficient and stable boiling heat dissipation. A pump-assisted capillary phase-change loop with methanol as working medium was established to study the effect of liquid-vapor pressure difference and heating power on its start-up and steady-state characteristics. The results indicated that the evaporator undergoes four heat transfer modes including flooded, partial flooded, thin film evaporation and overheating. The thin film evaporation mode was the most efficient one with the shortest start-up period. Besides, the heat transfer modes were determined by liquid-vapor pressure difference and power. The heat transfer coefficient could be significantly improved and the thermal resistance could be reduced by increasing liquid-vapor pressure difference as long as it did not exceed 8 kPa. However, when the liquid-vapor pressure difference exceeded 8kPa, its influence on the heat transfer coefficient weakened. In addition, a two-dimensional heat transfer mode distribution diagram considering both liquid-vapor pressure difference and power was drawn through a great number of experiments. During engineering application, the liquid-vapor pressure difference can be controlled to maintain efficient thin film evaporation in order to achieve the optimum heat dissipation effect.

Keywords

liquid cooling; phase-change loop; pressure difference; heat transfer enhancement

Subject

ENGINEERING, Energy & Fuel Technology

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.