DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW
AbstractEnhanced heat transfer in tubes under laminar flow conditions can be found in coils or corrugated tubes or in the presence of high wall relative roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. A modification...
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Brazilian Society of Chemical Engineering
2015-06-01
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doaj-7d83eac34cf74ccc92a737868c8fdc792020-11-24T22:51:24ZengBrazilian Society of Chemical EngineeringBrazilian Journal of Chemical Engineering0104-66322015-06-0132244545410.1590/0104-6632.20150322s00003318S0104-66322015000200445DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOWA. O. MoraisJ. A. W. GutAbstractEnhanced heat transfer in tubes under laminar flow conditions can be found in coils or corrugated tubes or in the presence of high wall relative roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. A modification of the Graetz problem for non-Newtonian power-law flow is proposed to take into account the augmented heat transfer by the introduction of an effective radial thermal diffusivity. The induced mixing was modeled as an increased radial heat transfer in a straight tube. Three experiments using a coiled tube and a tubular heat exchanger with high relative wall roughness are presented in order to show how this parameter can be obtained. Results were successfully correlated with Reynolds number. This approach can be useful for modeling laminar flow reactors (LFR) and tubular heat exchangers available in the chemical and food industries.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322015000200445&lng=en&tlng=enHeat transferLaminar flowDiffusivityLaminar flow reactorGraetz problem |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. O. Morais J. A. W. Gut |
spellingShingle |
A. O. Morais J. A. W. Gut DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW Brazilian Journal of Chemical Engineering Heat transfer Laminar flow Diffusivity Laminar flow reactor Graetz problem |
author_facet |
A. O. Morais J. A. W. Gut |
author_sort |
A. O. Morais |
title |
DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW |
title_short |
DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW |
title_full |
DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW |
title_fullStr |
DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW |
title_full_unstemmed |
DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW |
title_sort |
determination of the effective radial thermal diffusivity for evaluating enhanced heat transfer in tubes under non-newtonian laminar flow |
publisher |
Brazilian Society of Chemical Engineering |
series |
Brazilian Journal of Chemical Engineering |
issn |
0104-6632 |
publishDate |
2015-06-01 |
description |
AbstractEnhanced heat transfer in tubes under laminar flow conditions can be found in coils or corrugated tubes or in the presence of high wall relative roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. A modification of the Graetz problem for non-Newtonian power-law flow is proposed to take into account the augmented heat transfer by the introduction of an effective radial thermal diffusivity. The induced mixing was modeled as an increased radial heat transfer in a straight tube. Three experiments using a coiled tube and a tubular heat exchanger with high relative wall roughness are presented in order to show how this parameter can be obtained. Results were successfully correlated with Reynolds number. This approach can be useful for modeling laminar flow reactors (LFR) and tubular heat exchangers available in the chemical and food industries. |
topic |
Heat transfer Laminar flow Diffusivity Laminar flow reactor Graetz problem |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322015000200445&lng=en&tlng=en |
work_keys_str_mv |
AT aomorais determinationoftheeffectiveradialthermaldiffusivityforevaluatingenhancedheattransferintubesundernonnewtonianlaminarflow AT jawgut determinationoftheeffectiveradialthermaldiffusivityforevaluatingenhancedheattransferintubesundernonnewtonianlaminarflow |
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