Direct-Contact Heat Transfer Model for Dispersed-Flow Film Boiling

2000 ◽  
Vol 132 (3) ◽  
pp. 375-388 ◽  
Author(s):  
Stephen M. Bajorek ◽  
Michael Y. Young
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Heat Transfer Model ◽  
Film Boiling ◽  
Transfer Model ◽  
Contact Heat ◽  
Dispersed Flow ◽  
Contact Heat Transfer ◽  
Flow Film Boiling

Inter-particle contact heat transfer model: an extension to soils at elevated temperatures

2005 ◽  
Vol 29 (2) ◽  
pp. 131-144 ◽  
Author(s):  
W. H. Leong ◽  
V. R. Tarnawski ◽  
F. Gori ◽  
G. D. Buchan ◽  
J. Sundberg
Keyword(s):  
Heat Transfer ◽  
Elevated Temperatures ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Contact Heat ◽  
Particle Contact ◽  
Contact Heat Transfer

RBHT Steam Cooling and Droplet Injection Pre-Test Analysis Using COBRA-TF

2001 ◽  
Author(s):  
C. Frepoli ◽  
A. J. Ireland ◽  
L. E. Hochreiter ◽  
F. B. Cheung
Keyword(s):  
Heat Transfer ◽  
Local Heat Transfer ◽  
Injection System ◽  
Test Facility ◽  
Film Boiling ◽  
Two Phase ◽  
Field Representation ◽  
Dispersed Flow ◽  
Spacer Grids ◽  
Flow Film Boiling

Abstract The droplet injection experiments to be performed in a 7 × 7 rod bundle heat transfer test facility are being simulated using an advanced thermal hydraulics computer code called COBRA-TF. A current version of the code, which provides a three-dimensional, two-fluid, three-field representation of the two-phase flow, is modified to facilitate the simulation of the droplet field produced by the injection system in the test facility. The liquid phase is split into a continuous liquid field and droplet field where a separate momentum and mass equation is solved for each field, with the effects of spacer grids being properly accounted for. Pre-test analyses using the modified COBRA-TF code have been conducted for different injection conditions. Results indicate that there are specific ranges of conditions that can be simulated within the facility constraints to provide for validation of the dispersed flow film boiling models. The numerical results also show important effects of the spacer grids on the local heat transfer in the dispersed flow film boiling regime.

Heat Transfer Model in a Rotary Drum During the Fermentation Process

2020 ◽  
Vol 77 (1) ◽  
pp. 151-160
Author(s):  
Norazaliza Mohd Jamil ◽  
Aainaa Izyan Nafsun ◽  
Abdul Rahman Mohd Kasim
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Heat Transfer Coefficient ◽  
Fermentation Process ◽  
Transfer Model ◽  
Kutta Method ◽  
Contact Heat ◽  
Contact Heat Transfer ◽  
Runge Kutta Method ◽  
Rotary Drum

A new mathematical model describing heat transfer during the fermentation process in a rotary drum is proposed. The model includes representations of the kinetic reactions, the temperature of the solid bed, and physical structures within the rotary drum. The model is developed using five ordinary differential equations and was then solved using the Runge-Kutta method embedded in MATLAB software. A reasonable behaviour for the temperature profile to the fermentation process is achieved. The results show that the mass of the solid bed, contact heat transfer coefficient, and the wall temperature has a significant effect on the fermentation process in a rotary drum.

Increasing efficiency in direct contact heat transfer

1987 ◽  
Vol 6 (4) ◽  
pp. 208-210 ◽  
Author(s):  
Ralph F. Strigle ◽  
Tsuneo Nakano
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Contact Heat ◽  
Contact Heat Transfer
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