A Surface Renewal Model for Unsteady-State Transfer Processes

Babu D.R. and Narsimhan G. (1980) A Surface Renewal Model for Unsteady-State Transfer Processes. The Chemical Engineering Journal, 20 3: 169-175. doi:10.1016/0300-9467(80)80001-3


Author Babu D.R.
Narsimhan G.
Title A Surface Renewal Model for Unsteady-State Transfer Processes
Journal name The Chemical Engineering Journal
ISSN 0300-9467
Publication date 1980-01-01
Sub-type Article (original research)
DOI 10.1016/0300-9467(80)80001-3
Open Access Status Not Open Access
Volume 20
Issue 3
Start page 169
End page 175
Total pages 7
Subject 2200 Engineering
Abstract A surface renewal model is proposed for the analysis of free or fixed interfacial transport phenomena occurring in transient processes. These processes begin at a certain instant in a turbulent system in hydrodynamic equilibrium. For such a treatment a transient form of the generalized gamma residence time distribution function has been derived, from which the more relevant internal age distribution function has been obtained. Published data on four different systems, three of which pertain to entrance region transfer to fluids in turbulent flow and the fourth to transient heat transfer rates in gas fluidized beds, have been used to confirm the applicability of the dynamic model. The predictive expression relates the ratio of the transient Nusselt or Sherwood number to its respective steady-state value to the product of the ratio of the incomplete to complete gamma functions and a known function of the model parameters. The expression takes the form {A figure is presented}where ξ is given by {A figure is presented}In the limit of t tending to infinity, ψ becomes unity.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 28 Jun 2016, 13:51:41 EST by System User