Comparison of the DESSIM Model With a Finite Difference Solution for Rotary Desiccant Dehumidifiers

1989 ◽  
Vol 111 (4) ◽  
pp. 286-291 ◽  
Author(s):  
K. J. Schultz ◽  
J. W. Mitchell
Keyword(s):  
Mass Transfer ◽  
Steady State ◽  
Finite Difference ◽  
Heat And Mass Transfer ◽  
State Model ◽  
Analysis Tool ◽  
Simple Analysis ◽  
Steady State Model ◽  
Finite Difference Solution ◽  
Difference Solution

A heuristic “pseudo-steady-state” model of the heat and mass transfer occurring in desiccant dehumidifiers, embodied in the program DESSIM, has been proposed as a conceptually and numerically simple analysis tool (Barlow, 1982). A comparison is made with a finite difference solution to determine the accuracy and limitations of the pseudo-steady-state model. The comparison indicates that the pseudo-steady-state model can produce accurate results of dehumidifier performance relative to the finite difference solution when used carefully, although at greater computational expense. Substitution of the finite difference solution into the overall DESSIM program results in a potentially accurate and useful analysis tool.

A Steady-State Model of a Floating Ring Bearing, Including Thermal Effects

1992 ◽  
Vol 114 (1) ◽  
pp. 141-149 ◽  
Author(s):  
D. M. Clarke ◽  
C. Fall ◽  
G. N. Hayden ◽  
T. S. Wilkinson
Keyword(s):  
Mass Transfer ◽  
Steady State ◽  
Numerical Solution ◽  
Heat And Mass Transfer ◽  
Thermal Effects ◽  
State Model ◽  
Steady State Model ◽  
Lubricant Films ◽  
Energy Equations

A steady-state model of a conventional floating ring bearing is presented, specifically, to assess the feasibility of its use in the power generating industry. It necessitates the numerical solution of the Reynolds and energy equations for both inner and outer lubricant films. Oil recirculation and heat and mass transfer between the films are included. For the application considered, the oil temperatures and eccentricity ratios encountered are not excessive.

Steady state model for evaluation of external and internal mass transfer effects in an immobilized biofilm

2008 ◽  
Vol 99 (9) ◽  
pp. 3468-3474 ◽  
Author(s):  
Sandeep Mudliar ◽  
Saumita Banerjee ◽  
Atul Vaidya ◽  
Sukumar Devotta
Keyword(s):  
Mass Transfer ◽  
Steady State ◽  
State Model ◽  
Internal Mass ◽  
Transfer Effects ◽  
Internal Mass Transfer ◽  
Steady State Model

A Steady-State Model of Mass Transfer for Removing Cryoprotective Agents From Cryopreserved Blood With Hollow Fiber Modules

2008 ◽  
Author(s):  
Weiping Ding ◽  
Zhiquan Shu ◽  
Xiaoming Zhou ◽  
Xianjiang Kang ◽  
Dayong Gao
Keyword(s):  
Mass Transfer ◽  
Steady State ◽  
Cell Volume ◽  
Hollow Fiber ◽  
State Model ◽  
Model Coupling ◽  
Cryoprotective Agents ◽  
Removal Process ◽  
Steady State Model ◽  
Volume Response

A steady-state model coupling mass transfer across cell and fiber membranes is theoretically developed to investigate the removal process of cryoprotective agents (CPAs) from cryopreserved blood with hollow fiber modules, and then CPA concentration variation and cell volume response are studied.

scholarly journals Finite Difference Solution of Unsteady Flow Past an Oscillating Semi-Infinite Vertical Plate with Variable Surface Temperature and Uniform Mass Flux

2014 ◽  
Vol 19 (4) ◽  
pp. 709-724 ◽  
Author(s):  
R. Muthucumaraswamy ◽  
B. Saravanan
Keyword(s):  
Steady State ◽  
Finite Difference ◽  
Unsteady Flow ◽  
Thermal Radiation ◽  
Mass Flux ◽  
Vertical Plate ◽  
Grashof Number ◽  
Flow Past ◽  
Finite Difference Solution ◽  
Difference Solution

Abstract A finite difference solution of an unsteady flow past an oscillating semi-infinite vertical place with variable temperature and uniform mass flux is presented here. The fluid considered here is a gray, absorbing-emitting radiation but a non-scattering medium. The dimensionless governing equations are solved by an efficient, more accurate, and unconditionally stable and fast converging implicit scheme. The steady state velocity, temperature and concentration profiles are shown graphically. The effect of velocity and temperature for different physical parameters such as the thermal radiation, Schmidt number, thermal Grashof number and mass Grashof number is studied. It is observed that the velocity decreases in the presence of thermal radiation. It is also observed that the time taken to reach a steady-state is more in the case of vertical plate than horizontal plate.

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