Film boiling characteristics of liquid nitrogen sprays on a heated plate

Awonorin, S. O.

doi:10.1016/0017-9310(89)90157-9

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…Spray cooling has proven very effective because the momentum of the droplets allows the liquid to get much closer to the surface than it would if the surface was just immersed in the liquid, causing a thinner vapor film. The phenomena involved in this type of spray cooling have been widely studied (Deb and Yao, 1987;Wachters et al, 1966;Awonorin, 1989).…”

Section: Figmentioning

confidence: 99%

Impingement Cooling of Hot Metal Strips in Runout Table - A Review

Mishra

Nayak

Pradhan

et al. 2015

Interfac Phenom Heat Transfer

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Impingement cooling is an important and new cooling technique used in the steel quenching process. Unfortunately, little experimental data are available on the rate of heat extraction from the steel surface. For example, as one of the most important heat treatment processes, quenching of steel refers to the cooling from the solution treating temperature, typically 845 • C-870 • C, into the hard structure martensite. This paper addresses a comprehensive literature survey on different cooling techniques and various factors affecting the heat transfer characteristics during these cooling schemes.

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Section: Figmentioning

confidence: 99%

Impingement Cooling of Hot Metal Strips in Runout Table - A Review

Mishra

Nayak

Pradhan

et al. 2015

Interfac Phenom Heat Transfer

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“…However, the degree of dependence on velocity is different for each liquid, and thus, no general correlation involving the spray velocity was as successful as Eq. (6). Furthermore, no theoretical basis for correlating spray cooling CHF with the spray velocity could be found; whereas, the CHF model presented before is quite reasonable.…”

Section: (4)mentioning

confidence: 89%

“…The final correlation for CHF, obtained using LN2 and water data, is shown in Eq. (6). The comparison of the correlation to various data is shown in Fig.…”

Section: (4)mentioning

confidence: 96%

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Effect of spray characteristics on spray cooling with liquid nitrogen

Sehmbey

Chow

Hahn

et al. 1995

Journal of Thermophysics and Heat Transfer

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Operation of power electronics at liquid nitrogen (LN2) temperature is a very attractive possibility. However, a high heat flux (over 100 W/cm 2 ) cooling technique like spray cooling will have to be used to realize all the advantages of low-temperature operation. This study provides empirical correlations for LN2 spray cooling. A general semiempirical correlation (based on macrolayer dryout model) for spray cooling critical heat flux (CHF) is obtained. This correlation is shown to be very accurate for predicting spray cooling CHF for different liquids and spray conditions. An empirical correlation for heat flux is also presented. This study also shows the importance of surface roughness for spray cooling with liquid nitrogen. The rougher surfaces were shown to have significantly higher heat transfer rates and similar CHFs occurring at lower temperatures. NomenclatureC, = liquid specific heat at constant pressure, J/kg-K D = hydraulic diameter of heater surface, m d = diameter of a droplet in a spray sample, m d (l -diameter of the liquid disc formed by an impinging drop, m d 2() = surface mean diameter of spray, (2 d 2 A/V,) 1/2 , m d M) = volume mean diameter of spray, (S d 3 A/V,) 1/3 , m d^2 -Sauter mean diameter of spray, (S

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“…This type of heat transfer condition in modern technology includes relevance to evaporation processes, cooling and freezing of foods by cryogenic sprays. However, a survey of the literature reveals that most existing experimental and analytical works on evaporation times of liquid drops (Baumeister et al, 1966;Keshock and Bell, 1970;Pate1 and Bell, 1965;Wachters and Westerling, 1966;Awonorin, 1989a) were concerned and limited to only the cases where droplets were evaporated on hot metal plates while the plate temperature and volume of liquid were varied.…”

Section: Introductionmentioning

confidence: 99%

The Leidenfrost Phenomenon: Experimental Investigation of the Vaporization of Nitrogen Droplets on a Food Surface

Awonorin¹,

Lamb²

1990

Journal of Food Science

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The vaporization of liquid nitrogen droplets at rest on a gelatin slab of food material was investigated in relation to heat transfer in food freezing. Measurements were made of changes in droplet sizes during evaporation using a photographic technique while varying the slab surface temperature from f 10°C to -120°C at atmospheric pressure.The measured values of the vaporization time were about 12% higher than those theoretically predicted, and about 15% lower for droplets contaminated with moisture.

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Film boiling characteristics of liquid nitrogen sprays on a heated plate

Cited by 9 publications

References 12 publications

Impingement Cooling of Hot Metal Strips in Runout Table - A Review

Impingement Cooling of Hot Metal Strips in Runout Table - A Review

Effect of spray characteristics on spray cooling with liquid nitrogen

The Leidenfrost Phenomenon: Experimental Investigation of the Vaporization of Nitrogen Droplets on a Food Surface

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