Comparison of Mass and Heat Transfer Coefficients of Liquid-Desiccant Mixtures in a Packed Column

1991 ◽  
Vol 113 (1) ◽  
pp. 1-6 ◽  
Author(s):  
A. Ertas ◽  
E. E. Anderson ◽  
S. Kavasogullari
Keyword(s):  
Heat Transfer ◽  
Calcium Chloride ◽  
Lithium Chloride ◽  
Theoretical Study ◽  
Packed Column ◽  
Cost Effective ◽  
Liquid Desiccant ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Mass And Heat Transfer

In order to analyze the performance of packed columns for dehumidification processes, calculation of the mass and heat transfer coefficients of the packing material used in the column is necessary. This paper is concerned with the interface transfer of heat and mass when air is brought into contact with the liquid desiccant mixtures. A theoretical study of heat and mass transfer analysis in an air-desiccant dehumidification contact system (packed column) employing liquid-desiccants, namely calcium chloride (CaCl2), lithium chloride (LiCl), and a new liquid-desiccant mixture (Cost-Effective Liquid Desiccant, CELD) consisting of 50 percent lithium chloride and 50 percent calcium chloride is studied. Mass and heat transfer coefficients for the gas and liquid phase, by use of 0.5-in., 1-in., 1.5-in., and 2-in. ceramic Rasching rings, are calculated. The findings for the three liquid desiccants are compared and discussed.

scholarly journals Mass and Heat Transfer Coefficients in Automotive Exhaust Catalytic Converter Channels

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 507
Author(s):  
Chrysovalantis C. Templis ◽  
Nikos G. Papayannakos
Keyword(s):  
Heat Transfer ◽  
Flow Reactor ◽  
Catalytic Converter ◽  
Reaction Rates ◽  
Cfd Model ◽  
Automotive Exhaust ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Wide Range ◽  
Mass And Heat Transfer

Mass and heat transfer coefficients (MTC and HTC) in automotive exhaust catalytic monolith channels are estimated and correlated for a wide range of gas velocities and prevailing conditions of small up to real size converters. The coefficient estimation is based on a two dimensional computational fluid dynamic (2-D CFD) model developed in Comsol Multiphysics, taking into account catalytic rates of a real catalytic converter. The effect of channel size and reaction rates on mass and heat transfer coefficients and the applicability of the proposed correlations at different conditions are discussed. The correlations proposed predict very satisfactorily the mass and heat transfer coefficients calculated from the 2-D CFD model along the channel length. The use of a one dimensional (1-D) simplified model that couples a plug flow reactor (PFR) with mass transport and heat transport effects using the mass and heat transfer correlations of this study is proved to be appropriate for the simulation of the monolith channel operation.

Simultaneous estimation of the spacewise and timewise variations of mass and heat transfer coefficients in drying

2007 ◽  
Vol 15 (2) ◽  
pp. 137-150 ◽  
Author(s):  
Leonardo F. Saker ◽  
Helcio R. B. Orlande ◽  
Cheng-Hung Huang ◽  
Gligor H. Kanevce ◽  
Ljubica P. Kanevce
Keyword(s):  
Heat Transfer ◽  
Simultaneous Estimation ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Mass And Heat Transfer

Analysis of adsorption kinetics on zeolites at non isothermal conditions and analysis of the kinetics curves

1981 ◽  
Vol 46 (3) ◽  
pp. 678-686 ◽  
Author(s):  
Arkadij Bezus ◽  
Arlette Zikánová ◽  
Miloš Smutek ◽  
Milan Kočiřík
Keyword(s):  
Heat Transfer ◽  
Adsorption Kinetics ◽  
Model Testing ◽  
Adsorption Kinetic ◽  
Transfer Coefficients ◽  
Kinetic Curves ◽  
Isothermal Conditions ◽  
Heat Transfer Coefficients ◽  
Mass And Heat Transfer

Adsorption kinetic curves were numerically simulated for the case of simultaneous mass and heat transfer. Proposed and discussed are different methods of model testing, experimental curves fitting and of evaluation of the diffusion and heat transfer coefficients from experimental kinetic curves.

Inverse Determination of Steady Heat Convection Coefficient Distributions

1998 ◽  
Vol 120 (2) ◽  
pp. 328-334 ◽  
Author(s):  
T. J. Martin ◽  
G. S. Dulikravich
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Boundary Conditions ◽  
Measurement Data ◽  
Cost Effective ◽  
Heat Fluxes ◽  
Transfer Coefficients ◽  
Simple Modification ◽  
Heat Transfer Coefficients ◽  
Thermal Boundary Conditions

An inverse Boundary Element Method (BEM) procedure has been used to determine unknown heat transfer coefficients on surfaces of arbitrarily shaped solids. The procedure is noniterative and cost effective, involving only a simple modification to any existing steady-state heat conduction BEM algorithm. Its main advantage is that this method does not require any knowledge of, or solution to, the fluid flow field. Thermal boundary conditions can be prescribed on only part of the boundary of the solid object, while the heat transfer coefficients on boundaries exposed to a moving fluid can be partially or entirely unknown. Over-specified boundary conditions or internal temperature measurements on other, more accessible boundaries are required in order to compensate for the unknown conditions. An ill-conditioned matrix results from the inverse BEM formulation, which must be properly inverted to obtain the solution to the ill-posed problem. Accuracy of numerical results has been demonstrated for several steady two-dimensional heat conduction problems including sensitivity of the algorithm to errors in the measurement data of surface temperatures and heat fluxes.

Sign in / Sign up

Export Citation Format

Share Document