Film Boiling of Liquid Nitrogen on a Sphere in an Enclosure

Anomalous Behavior of Heat Transfer in Film Boiling of Liquid Nitrogen in Tubes at Large Subcoolings and Mass Flow Velocities

Heat Transfer Research ◽

10.1615/heattransres.v32.i4-6.80 ◽

2001 ◽

Vol 32 (4-6) ◽

pp. 9

Author(s):

V. P. Firsov ◽

I. V. Artyukhov

Keyword(s):

Heat Transfer ◽

Liquid Nitrogen ◽

Mass Flow ◽

Anomalous Behavior ◽

Film Boiling ◽

Flow Velocities

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LOCAL HEAT TRANSFER COEFFICIENTS IN FILM BOILING OF LIQUID NITROGEN ON A VERTICAL SURFACE

10.1615/ihtc5.290 ◽

1974 ◽

Author(s):

K. N. Seetharamu ◽

Muralidhar V. Krishnamurthy ◽

A. Ramachandran

Keyword(s):

Heat Transfer ◽

Liquid Nitrogen ◽

Local Heat Transfer ◽

Local Heat ◽

Vertical Surface ◽

Film Boiling ◽

Transfer Coefficients ◽

Heat Transfer Coefficients

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Film boiling of liquid nitrogen from porous surfaces with vapor suction: Experimental extensions

AIChE Journal ◽

10.1002/aic.690120419 ◽

1966 ◽

Vol 12 (4) ◽

pp. 727-736 ◽

Cited By ~ 8

Author(s):

V. K. Pai ◽

S. G. Bankoff

Keyword(s):

Liquid Nitrogen ◽

Film Boiling ◽

Porous Surfaces

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An Experimental Study on Cryogenic Spray Quenching of a Circular Metal Disk II. Chilldown Efficiency and Effects of Coating and Flow Pulsing

Journal of Heat Transfer ◽

10.1115/1.4053182 ◽

2021 ◽

Author(s):

Jun Dong ◽

Hao Wang ◽

Samuel Darr ◽

Jason Hartwig ◽

Jacob Chung

Keyword(s):

Heat Transfer ◽

Mass Flow Rate ◽

Liquid Nitrogen ◽

Mass Flow ◽

Flow Rate ◽

Continuous Flow ◽

Nucleate Boiling ◽

Film Boiling ◽

Teflon Coating ◽

Bare Surface

Abstract This is the second part of a two-part series that presents the results of liquid nitrogen spray quenching of a Stainless Steel disc. The results of continuous-flow spray chilldown of a bare surface disc are summarized first that serves as the baseline information for evaluating the effects of disc surface coating and pulse flow. We found that for continuous-flow spray chilldown of a bare surface disc, the chilldown efficiency is mainly a function of the average mass flow rate with the trend of decreasing efficiency with increasing mass flow rate. Additional experiments were performed to evaluate the enhancement of cryogenic spray quenching by three techniques: 1. Using intermittent pulse sprays on SS bare surface, 2. Coating the SS surface with a layer of low thermal conductivity Teflon film, and 3. Spraying liquid nitrogen intermittently on the coated SS surface. In general, the results indicate that all three methods effectively produced higher spray thermal efficiencies and reduced liquid nitrogen mass consumption. However, it was also found that the Teflon coating was more effective than the flow pulsing due to that the Teflon coating induced a large surface temperature drop at the beginning of the chilldown that allowed the quenching to move quickly from poor heat transfer film boiling to efficient heat transfer transition and nucleate boiling regimes. This quick transition shortens the film boiling period, thus facilitates the switch to much higher heat transfer transition boiling and nucleate boiling periods earlier to complete the chilldown process faster.

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