What is it about?
Liquefied Natural Gas (LNG) could be used to manage a heat load prior to combustion, through phase-change heat transfer, for better Size-Weight-and-Power (SWaP) system performance. In this paper an experimental heat exchanger for this application was designed and then experimentally tested. Design correlations were developed to model the flow and thermal behavior. In particular, an old analytical film-boiling equation by Berenson was modified for impinging jets to accurately predict heat transfer.
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Why is it important?
The conventional wisdom for phase-change heat transfer is to design a system to operate in the nucleate boiling regime, close to the critical heat flux (CHF). However, this paper suggests that it might be desirable to operate in the film boiling regime, where higher heat fluxes can be attained at room temperature. The modified Berenson's equation is suggested as an accurate model for this design configuration. Additionally, this paper summarizes some practical concerns and suggestions for a real system implementation.
Perspectives
As an undergraduate, this work was a great opportunity for me to perform research in the thermofluids field. I am particularly proud of my modification and application of Berenson's film boiling equation, which nicely accounts for our experimental results without the addition of any fudge factors. My hope is that this work might spark further research into film-boiling heat transfer, which so far as I can tell is still not well understood.
Nicholas Pellizzari
Read the Original
This page is a summary of: System-level Impingement cooling with Cryogens, June 2020, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2020-3284.
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