The Effect of Subcooled Liquid on Laminar Film Boiling

1962 ◽  
Vol 84 (2) ◽  
pp. 149-155 ◽  
Author(s):  
E. M. Sparrow ◽  
R. D. Cess
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Transfer Problem ◽  
Film Boiling ◽  
Physical Parameters ◽  
Two Phase ◽  
Fixed Temperature ◽  
Subcooled Liquid ◽  
Flow And Heat Transfer ◽  
Parameter Ranges

Heat-transfer results for film boiling in the presence of a subcooled liquid have been determined analytically for the case of the isothermal vertical plate. The two-phase flow and heat-transfer problem which arises has been formulated exactly within the framework of boundary-layer theory, and free convection within the liquid has been accounted for. At a fixed temperature difference between surface and saturation, the effect of subcooling is to increase the heat transfer from the plate surface, with the magnitude of the increase being controlled by five physical parameters. Graphical presentation of the heat-transfer results is made for parametric values which correspond to water, but this information may be applied to other fluids having similar parameter ranges. For large subcooling, the heat transfer is essentially equal to that for pure free convection (no boiling), and the limits for this condition are given.

scholarly journals MHD Flow of a Viscous Fluid over an Exponentially Stretching Sheet in a Porous Medium

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Iftikhar Ahmad ◽  
Muhmmad Sajid ◽  
Wasim Awan ◽  
Muhammad Rafique ◽  
Wajid Aziz ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Differential Equations ◽  
Stretching Sheet ◽  
Transfer Problem ◽  
Heat Transfer Analysis ◽  
Physical Parameters ◽  
Exponentially Stretching Sheet ◽  
Flow And Heat Transfer ◽  
Exponentially Stretching

Radiation effects on magnetohydrodynamic (MHD) boundary-layer flow and heat transfer characteristic through a porous medium due to an exponentially stretching sheet have been studied. Formulation of the problem is based upon the variable thermal conductivity. The heat transfer analysis is carried out for both prescribed surface temperature (PST) and prescribed heat flux (PHF) cases. The developed system of nonlinear coupled partial differential equations is transformed to nonlinear coupled ordinary differential equations by using similarity transformations. The series solutions for the transformed of the transformed flow and heat transfer problem were constructed by homotopy analysis method (HAM). The obtained results are analyzed under the influence of various physical parameters.

MHD free convection in a porous non-uniformly heated triangle cavity equipped with a circular obstacle subjected to various thermal configurations

2020 ◽  
Vol 34 (31) ◽  
pp. 2050354
Author(s):  
Mohammed M. Mousa
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Temperature Field ◽  
Free Convection ◽  
Sensitivity Study ◽  
Thermal Boundary Condition ◽  
Physical Parameters ◽  
Flow And Heat Transfer ◽  
Side Walls ◽  
Element Technique

This study numerically investigates the magnetohydrodynamic (MHD) free convection of a fluid in a porous triangle cavity containing a circular obstacle subjected to various thermal configurations. The investigation is conducted using a penalty finite element technique. The inclined side walls are non-uniformly heated while the bottom is maintained cold isothermal. Three types of thermal configurations are considered at the obstacle boundary. The effects of various physical parameters on the MHD free convection have been studied. The temperature field, fluid flow and heat transfer are strongly dependent on the type of thermal boundary condition of the circular obstacle, Prandtl number and magnetic induction. The obtained results are verified with a grid sensitivity study and validated using existing results in literature. A comparison between the present results and ones existing in literature illustrates the reliability and dependability of this study.

scholarly journals Автомодельность в задаче о ламинарном пленочном кипении на вертикальной поверхности, погруженной в большой объем жидкости

2021 ◽  
Vol 91 (3) ◽  
pp. 402
Author(s):  
В.Б. Хабенский ◽  
А.А. Сулацкий
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Radiative Heat ◽  
Heated Surface ◽  
Vertical Surface ◽  
Film Boiling ◽  
Saturated Liquid ◽  
Self Similarity ◽  
Continuous Transition ◽  
Subcooled Liquid

Two expressions for the Nusselt criterion have been formulated by applying self-similarity methods to the laminar free-convection film boiling on a vertical surface having the finite length, which is submerged into the large volume of arbitrary subcooled liquid. The expressions apply Nusselt criterion to the conditions of continuous transition from film boiling in saturated liquid to the strongly subcooled liquid in order to determine heat transfer between the heated surface and interphase boundary, and heat transfer from this boundary into the volume of liquid; the accompanying radiative heat transfer is taken into account. The hierarchy of different self-similarities is presented.

Numerical modeling of the influence of bubbles on flow and heat transfer in the descending gas-liquid flow in a pipe

2012 ◽  
Vol 9 (1) ◽  
pp. 131-135
Author(s):  
M.A. Pakhomov
Keyword(s):  
Heat Transfer ◽  
Gas Phase ◽  
Liquid Flow ◽  
Bubble Diameter ◽  
Gas Content ◽  
Two Phase ◽  
Eulerian Description ◽  
Flow And Heat Transfer ◽  
Gas Liquid Flow ◽  
The Mathematical Model

The paper presents the results of modeling the dynamics of flow, friction and heat transfer in a descending gas-liquid flow in the pipe. The mathematical model is based on the use of the Eulerian description for both phases. The effect of a change in the degree of dispersion of the gas phase at the input, flow rate, initial liquid temperature and its friction and heat transfer rate in a two-phase flow. Addition of the gas phase causes an increase in heat transfer and friction on the wall, and these effects become more noticeable with increasing gas content and bubble diameter.

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