Enhancement of convective quenching heat transfer by coated tubes and intermittent cryogenic pulse flows

Chung, J. N.; Dong, Jun; Wang, Hao; Darr, Samuel; Hartwig, Jason

doi:10.1016/j.ijheatmasstransfer.2019.06.080

Cited by 26 publications

(17 citation statements)

References 22 publications

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“…It is noted that the tube inner surface temperature and heat flux were obtained using the measured outer wall surface temperature through an inverse conduction method developed by Burgraff 22 . Readers are referred to current authors’ previous papers 17 , 19 for details. The chilldown curve and corresponding boiling curve are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…We can see that is a function of during the transient 17 . In essence, initially, the heat transfer rate between the two materials is very high, but it also drops off quickly.…”

Section: Introductionmentioning

confidence: 87%

“…( 1 ), the duty cycle (DC) of the pulse flow is the dominant factor on the cooling enhancement solely by the exponential decay of the thermal transport in time, the effect of different periods is only of the second-order effect. Chung et al 17 found that the pulsed flow would raise the chilldown efficiency up to 67% over the continuous flow case for the convective chilldown of a metal pipe. Chung et al 17 also reported that the chilldown efficiency increases with decreasing DC, but it is insensitive to the period.…”

Section: Introductionmentioning

confidence: 99%

“…Chung et al 17 found that the pulsed flow would raise the chilldown efficiency up to 67% over the continuous flow case for the convective chilldown of a metal pipe. Chung et al 17 also reported that the chilldown efficiency increases with decreasing DC, but it is insensitive to the period.…”

Section: Introductionmentioning

confidence: 99%

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Cryogenic spray quenching of simulated propellant tank wall using coating and flow pulsing in microgravity

et al. 2022

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In-space cryogenic propulsion will play a vital role in NASA’s return to the Moon mission and future mission to Mars. The enabling of in-space cryogenic engines and cryogenic fuel depots for these future manned and robotic space exploration missions begins with the technology development of advanced cryogenic thermal-fluid management systems for the propellant transfer lines and storage system. Before single-phase liquid can flow to the engine or spacecraft receiver tank, the connecting transfer line and storage tank must first be chilled down to cryogenic temperatures. The most direct and simplest method to quench the line and the tank is to use the cold propellant itself that results in the requirement of minimizing propellant consumption during chilldown. In view of the needs stated above, a highly efficient thermal-fluid management technology must be developed to consume the minimum amount of cryogen during chilldown of a transfer line and a storage tank. In this paper, we suggest the use of the cryogenic spray for storage tank chilldown. We have successfully demonstrated its feasibility and high efficiency in a simulated space microgravity condition. In order to maximize the storage tank chilldown efficiency for the least amount of cryogen consumption, the technology adopted included cryogenic spray cooling, Teflon thin-film coating of the simulated tank surface, and spray flow pulsing. The completed flight experiments successfully demonstrated that spray cooling is the most efficient cooling method for the tank chilldown in microgravity. In microgravity, Teflon coating alone can improve the efficiency up to 72% and the efficiency can be improved up to 59% by flow pulsing alone. However, Teflon coating together with flow pulsing was found to substantially enhance the chilldown efficiency in microgravity for up to 113%.

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Section: Resultsmentioning

confidence: 99%

“…We can see that is a function of during the transient 17 . In essence, initially, the heat transfer rate between the two materials is very high, but it also drops off quickly.…”

Section: Introductionmentioning

confidence: 87%