Mass and Heat Transfer Rates for Large Gradients of Concentration and Temperature

1965 ◽  
Vol 4 (3) ◽  
pp. 345-353 ◽  
Author(s):  
W. E. Ranz ◽  
P. F. Dickson
Keyword(s):  
Heat Transfer ◽  
Transfer Rates ◽  
Mass And Heat Transfer

scholarly journals Cumulative Impact of Micropolar Fluid and Porosity on MHD Channel Flow: A Numerical Study

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 93
Author(s):  
Kottakkaran Sooppy Nisar ◽  
Aftab Ahmed Faridi ◽  
Sohail Ahmad ◽  
Nargis Khan ◽  
Kashif Ali ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Chemical Reaction ◽  
Micropolar Fluid ◽  
Numerical Study ◽  
Nonlinear Differential Equations ◽  
X Rays ◽  
Cumulative Impact ◽  
Transfer Rates ◽  
Mass And Heat Transfer ◽  
The Impact

The mass and heat transfer magnetohydrodynamic (MHD) flows have a substantial use in heat exchangers, electromagnetic casting, X-rays, the cooling of nuclear reactors, mass transportation, magnetic drug treatment, energy systems, fiber coating, etc. The present work numerically explores the mass and heat transportation flow of MHD micropolar fluid with the consideration of a chemical reaction. The flow is taken between the walls of a permeable channel. The quasi-linearization technique is utilized to solve the complex dynamical coupled and nonlinear differential equations. The consequences of the preeminent parameters are portrayed via graphs and tables. A tabular and graphical comparison evidently reveals a correlation of our results with the existing ones. A strong deceleration is found in the concentration due to the effect of a chemical reaction. Furthermore, the impact of the magnetic field force is to devaluate the mass and heat transfer rates not only at the lower but at the upper channel walls, likewise.

Analysis of Laminar Falling Film Condensation Over a Vertical Plate With an Accelerating Vapor Flow

2009 ◽  
Vol 131 (7) ◽  
Author(s):  
A.-R. A. Khaled ◽  
Abdulhaiy M. Radhwan ◽  
S. A. Al-Muaikel
Keyword(s):  
Heat Transfer ◽  
Vertical Plate ◽  
Finite Difference Methods ◽  
Saturation Temperature ◽  
Film Condensation ◽  
Vapor Flow ◽  
Falling Film ◽  
Suction Parameter ◽  
Transfer Rates ◽  
Mass And Heat Transfer

Laminar falling film condensations over a vertical plate with an accelerating vapor flow is analyzed in this work in the presence of condensate suction or slip effects at the plate surface. The following assumptions are made: (i) laminar condensate flow having constant properties, (ii) pure vapor with a uniform saturation temperature in the vapor region, and (iii) the shear stress at the liquid/vapor interface is negligible. The appropriate fundamental governing partial differential equations for the condensate and vapor flows (continuity, momentum, and energy equations) for the above case are identified, nondimensionalized, and transformed using nonsimilarity transformation. The transformed equations were solved using numerical, iterative, and implicit finite-difference methods. It is shown that the freestream striking angle has insignificant influence on the condensation mass and heat transfer rates, except when slip condition is present and at relatively small Grl/Re2 values. Moreover, it is shown that increasing the values of the dimensionless suction parameter (VS) results to an increase in dimensionless mass of condensate (Γ(L)/(μl Re)) and Nusselt number (Nu(L)/Re1/2). Thus, it results in an increase in condensation mass and heat transfer rates. Finally, it is found that the condensation and heat transfer rates increase as Jakob number, slip parameter, and saturation temperature increase. Finally, the results of this work not only enrich the literature of condensation but also provide additional methods for saving thermal energy.

Mass and heat transfer in a diatomic gas

1971 ◽  
Vol 6 (3) ◽  
pp. 547-560 ◽  
Author(s):  
J. C. Haas ◽  
V. S. Arapaci ◽  
G. S. Springer
Keyword(s):  
Heat Transfer ◽  
Degrees Of Freedom ◽  
Numerical Solutions ◽  
Full Range ◽  
Heat Fluxes ◽  
Transfer Rates ◽  
Diatomic Gas ◽  
Parallel Surfaces ◽  
Mass And Heat Transfer ◽  
Analytical Expressions

The transfer of mass and heat through a diatomic gas bounded by two plane parallel surfaces is investigated by a kinetic model which includes translational, rotational and vibrational degrees of freedom. A full range moment method is employed in the solution. Numerical solutions obtained for small temperature and pressure differences show the effect of inelastic collisions on the mass and heat fluxes. Approximate analytical expressions are derived for the mass and heat transfer rates, which are valid over the entire density range and yield the correct free-molecule and continuum limits. The results agree well with existing heat transfer and density measurements.

scholarly journals Dufour-Soret Effects on 3D Convective Viscoelastic Fluid Flow Upon a Stretched Surface

2018 ◽  
Vol 7 (4.10) ◽  
pp. 598
Author(s):  
M. Bhuvaneswari ◽  
S. Sivasankaran ◽  
S. Karthikeyan ◽  
S. Rajan
Keyword(s):  
Heat Transfer ◽  
Viscoelastic Fluid ◽  
Three Dimensional ◽  
Internal Heat ◽  
Boundary Layer Flows ◽  
Transfer Rates ◽  
Linear Ordinary Differential Equations ◽  
Nusselt Numbers ◽  
Homotopy Analysis ◽  
Mass And Heat Transfer

The purpose of this analytical work is to investigate the Dufour-Soret effects on three dimensional unsteady boundary layer flows, mass and heat transfer of a viscoelastic fluid upon a stretched surface in the existence of internal heat generation/absorption. The equations governing the flow are converted using similarity variables into a set of non-linear ordinary differential equations. The series solution is obtained by homotopy analysis. The results are analyzed for the influences of the various pertinent constants involving in the study. The mass and heat transfer rates are calculated by the localized Sherwood and Nusselt numbers along the surface.  

scholarly journals Local Mass and Heat Transfer on a Turbine Blade Tip

2003 ◽  
Vol 9 (2) ◽  
pp. 81-95 ◽  
Author(s):  
P. Jin ◽  
R. J. Goldstein
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Turbine Blade ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Tip Clearance ◽  
Transfer Rates ◽  
Average Mass ◽  
Blade Tip ◽  
Mass And Heat Transfer

Local mass and heat transfer measurements on a simulated high-pressure turbine blade-tip surface are conducted in a linear cascade with a nonmoving tip endwall, using a naphthalene sublimation technique. The effects of tip clearance (0.86–6.90% of chord) are investigated at various exit Reynolds numbers (4–7 ×105) and turbulence intensities (0.2 and 12.0%).The mass transfer on the tip surface is significant along its pressure edge at the smallest tip clearance. At the two largest tip clearances, the separation bubble on the tip surface can cover the whole width of the tip on the second half of the tip surface. The average mass-transfer rate is highest at a tip clearance of 1.72% of chord. The average mass-transfer rate on the tip surface is four and six times as high as on the suction and the pressure surface, respectively. A high mainstream turbulence level of 12.0% reduces average mass-transfer rates on the tip surface, while the higher mainstream Reynolds number generates higher local and average mass-transfer rates on the tip surface.

Heat Transfer in the Meniscus Thin-Film Transition Region

1979 ◽  
Vol 101 (3) ◽  
pp. 543-547 ◽  
Author(s):  
F. W. Holm ◽  
S. P. Goplen
Keyword(s):  
Heat Transfer ◽  
Surface Wetting ◽  
Transfer Coefficients ◽  
Transfer Rates ◽  
Heat Transfer Coefficients ◽  
Attachment Region ◽  
Groove Configurations ◽  
Mass And Heat Transfer ◽  
Liquid Flows ◽  
Solid Liquid

Capillary surface wetting is a passive phenomenon that depends on free surface energies. As heat transfer rates increase, within limits, more liquid flows onto the surface and evaporates. The differential equations describing mass and heat transfer mechanisms have been solved simultaneously for several capillary groove configurations. Further, by methods outlined in this paper, the effects of solid-liquid-vapor interline heat transfer phenomena can be isolated and evaluated. Not only does this provide a method for predicting surface heat transfer coefficients for surfaces wetted through capillary grooves, it also provides basic information about heat transfer in the vicinity of the meniscus attachment region.

HEAT TRANSFER PECULIARITIES IN HETEROGENEOUS SYSTEMS WITH HIGH UNSTEADY-STATE HEAT TRANSFER RATES

1970 ◽  
Author(s):  
N.V. Antonishin ◽  
S. S. Zabrodsky ◽  
L.E. Simchenko ◽  
V.V. Lushchikov
Keyword(s):  
Heat Transfer ◽  
Heterogeneous Systems ◽  
Unsteady State ◽  
Transfer Rates ◽  
State Heat

APPLICATION OF ADSORPTION METHOD FOR DETERMINATION OF LOCAL CONVECTIVE HEAT TRANSFER RATES

1974 ◽  
Author(s):  
S. Koncar-Djurdjevic ◽  
M. Mitrovic ◽  
S. Cvijovic ◽  
G. Popovic ◽  
Dimitrije Voronjec
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Adsorption Method ◽  
Transfer Rates
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