Logarithmic Mean Pressure DifferenceA New Concept in the Analysis of the Flow Distribution in Parallel Channels of Plate Heat Exchangers
(2012) In Heat Transfer Engineering 33(8). p.669681 Abstract
 This paper deals with a new concept of logarithmic mean pressure difference (LMPD) to find an accurate mean or true friction coefficient for variable flow in parallel flow channels of the plate heat exchangers while considering the first and the last channel pressure drops. This is analogous to the log mean temperature difference (LMTD) used for the computation of heat transfer in heat exchangers. A method has been suggested to improve the computation of mean or a newly defined "true friction factor" and the mean velocity for considerable flow variations in the channels. A comparative study has been made between the conventional average friction factor and the true mean friction factor for large parallel channels. The results have also... (More)
 This paper deals with a new concept of logarithmic mean pressure difference (LMPD) to find an accurate mean or true friction coefficient for variable flow in parallel flow channels of the plate heat exchangers while considering the first and the last channel pressure drops. This is analogous to the log mean temperature difference (LMTD) used for the computation of heat transfer in heat exchangers. A method has been suggested to improve the computation of mean or a newly defined "true friction factor" and the mean velocity for considerable flow variations in the channels. A comparative study has been made between the conventional average friction factor and the true mean friction factor for large parallel channels. The results have also been compared between the mean channel pressure drop and LMPD for different sizes of the channels. The analysis shows that the mean channel pressure drop of parallel channels can be predicted accurately by using the socalled true mean friction factor rather than the average friction factor. Using the LMPD method, one can find the last channel pressure drop by knowing the first channel pressure drop of the plate package. Hence, the nature of flow distribution in parallel channels can be predicted easily. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/2494928
 author
 Shaji, K.; Rao, Bobbili Prabhakara; Sundén, Bengt ^{LU} ; Roetzel, Wilfried and Das, Sarit K.
 organization
 publishing date
 2012
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Heat Transfer Engineering
 volume
 33
 issue
 8
 pages
 669  681
 publisher
 Taylor & Francis
 external identifiers

 wos:000302012500001
 scopus:84863400147
 ISSN
 15210537
 DOI
 10.1080/01457632.2011.635564
 language
 English
 LU publication?
 yes
 id
 c647492131244f49878ccbe410dbe2db (old id 2494928)
 date added to LUP
 20120510 13:52:22
 date last changed
 20180318 03:23:27
@article{c647492131244f49878ccbe410dbe2db, abstract = {This paper deals with a new concept of logarithmic mean pressure difference (LMPD) to find an accurate mean or true friction coefficient for variable flow in parallel flow channels of the plate heat exchangers while considering the first and the last channel pressure drops. This is analogous to the log mean temperature difference (LMTD) used for the computation of heat transfer in heat exchangers. A method has been suggested to improve the computation of mean or a newly defined "true friction factor" and the mean velocity for considerable flow variations in the channels. A comparative study has been made between the conventional average friction factor and the true mean friction factor for large parallel channels. The results have also been compared between the mean channel pressure drop and LMPD for different sizes of the channels. The analysis shows that the mean channel pressure drop of parallel channels can be predicted accurately by using the socalled true mean friction factor rather than the average friction factor. Using the LMPD method, one can find the last channel pressure drop by knowing the first channel pressure drop of the plate package. Hence, the nature of flow distribution in parallel channels can be predicted easily.}, author = {Shaji, K. and Rao, Bobbili Prabhakara and Sundén, Bengt and Roetzel, Wilfried and Das, Sarit K.}, issn = {15210537}, language = {eng}, number = {8}, pages = {669681}, publisher = {Taylor & Francis}, series = {Heat Transfer Engineering}, title = {Logarithmic Mean Pressure DifferenceA New Concept in the Analysis of the Flow Distribution in Parallel Channels of Plate Heat Exchangers}, url = {http://dx.doi.org/10.1080/01457632.2011.635564}, volume = {33}, year = {2012}, }