Film-Boiling Heat Transfer

Kalinin, E. K.; Berlin, I. I.; Kostyuk, V. V.

doi:10.1016/s0065-2717(08)70074-1

Cited by 36 publications

(3 citation statements)

References 75 publications

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“…As reviewed by various researchers [7][8][9][10][11][12][42][43][44], there are a number of correlations for heat transfer in the post dryout region. However, these correlations are developed without detailed knowledge of two-phase hydrodynamics.…”

Section: Discussionmentioning

confidence: 99%

Two-phase flow characteristic of inverted bubbly, slug and annular flow in post-critical heat flux region

Ishii

Denten

1990

Nuclear Engineering and Design

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Inverted annular flow can be visualized as a liquid jet-like core surrounded by a vapor annulus. While many analytical and experimental studies of heat transfer in this regime have been performed, there is very little understanding of the basic hydrodynamics of the post-CHF flow field. However, a recent experimental study was done that was able to successfully investigate the effects of various steady-state inlet flow parameters on the post-CHF hydrodynamics of the film boiling of a single phase liquid jet. This study was carried out by means of a visual photographic analysis of an idealized single phase core inverted annular flow initial geometry (single phase liquid jet core surrounded by a coaxial annulus of gas). In order to extend this study, a subsequent flow visualization of an idealized two-phase core inverted annular flow geometry (two-phase central jet core, surrounded by a coaxial annulus of gas) was carried out. The objective of this second experimental study was to investigate the effect of steadystate inlet, pre-CHF two-phase jet core parameters on the hydrodynamics of the post-CHF flow field. In actual film boiling situations, two-phase flows with net positive qualities at the CHF point are encountered. Thus, the focus of the present experimental study was on the inverted bubbly, slug, and annular flow fields in the post dryout film boiling region. Observed post dryout hydrodynamic behavior is reported. A correlation for the axial extent of the transition flow pattern between inverted annular and dispersed droplet flow (the agitated regime) is developed. It is shown to depend strongly on inlet jet core parameters and jet void fraction at the dryout point. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or othrrwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United Stales Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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Section: Discussionmentioning

confidence: 99%

Two-phase flow characteristic of inverted bubbly, slug and annular flow in post-critical heat flux region

Ishii

Denten

1990

Nuclear Engineering and Design

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“…At the same time high strip temperature induces boiling phenomena along film, transition and nucleate boiling regimes. The details of the boiling heat transfer and jet impingement can be found in [2,3,4,5]. The most suitable manner of characterizing heat transfer process is to determine the heat transfer coefficient HTC h, which allows calculating heat flux using a simple Newton's law of cooling.…”

Section: Introductionmentioning

confidence: 99%

Implementation of the Axially Symmetrical and Three Dimensional Finite Element Models to the Determination of the Heat Transfer Coefficient Distribution on the Hot Plate Surface Cooled by the Water Spray Nozzle

Malinowski¹,

Telejko²,

Hadała³

et al. 2012

KEM

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Plate and strip hot rolling lines are equipped with water cooling systems used to control the deformed material temperature. This system has a great importance in the case of thermal - mechanical deformation of steel which is focused on formation a proper microstructure and mechanical properties. The desired rate of cooling is achieved by water spray or laminar cooling applied to the hot surface of a strip. The water flow rate and pressure can be changed in a wide range and it will result in a very different heat transfer from the cooled material to the cooling water. The suitable cooling rate and the deformed material temperature can be determined based on numerical simulations. In this case thermal boundary conditions have to be specified on the cooled surface. The determination of the heat transfer coefficient distribution in the area of the water spray nozzle would improve numerical simulations significantly. In the paper an attempt is made to determine the heat transfer coefficient distribution on the hot plate surface cooled by the water spray nozzle. In the inverse method direct axially symmetrical and three dimensional solutions to the plate temperature field have been implemented. The computation time and the achieved accuracy have been compared for five cases. The studied cases differed in the maximum value of the heat transfer coefficient in nozzle spray axis and its distribution in the cooling time.

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“…One such research was conducted by the pioneering investigator, Bromley [1], who in 1950 investigated laminar film boiling on a horizontal cylinder. Kalinin et al [4] presented the film pool boiling including the reports of laminar flow of vapor inside a film with a stable interface and unstable interface. In 1966, Nishikwa and Ito [2] analyzed two-phase boundary-layer treatment of free-convection film boiling.…”

Section: Introductionmentioning

confidence: 99%

Turbulent Film Boiling on A Non-Isothermal Horizontal Elliptical Tube with Steam Heating Surface

Wang

Chen

2010

J. mech.

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The present theoretical study investigates turbulent film boiling on an elliptical tube with steam heating surface inside. The flow direction of the heating steam is opposite to the vapor film of the outer tube. Thus, the surface temperature is expressed by cosine function. The effect of temperature amplitude, eccentricity, nonlinear viscosity, nonlinear thermal conductivity, radiation and eddy diffusivity are all included in the present analysis. And the paper also discusses the vapor thickness, local Nusselt number and mean Nusselt number. The result shows, first, under the free convection turbulent film boiling with temperature variation, the bigger the temperature amplitude value is, the better the heat transfer efficiency is. Next, the increase of the eccentricity values will bring out the increase of the Nusselt number. Finally, a comparison between the results of the present study and those reported in a previous theoretical data is provided.

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Film-Boiling Heat Transfer

Cited by 36 publications

References 75 publications

Two-phase flow characteristic of inverted bubbly, slug and annular flow in post-critical heat flux region

Two-phase flow characteristic of inverted bubbly, slug and annular flow in post-critical heat flux region

Implementation of the Axially Symmetrical and Three Dimensional Finite Element Models to the Determination of the Heat Transfer Coefficient Distribution on the Hot Plate Surface Cooled by the Water Spray Nozzle

Turbulent Film Boiling on A Non-Isothermal Horizontal Elliptical Tube with Steam Heating Surface

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