Multipass tube flow in mixed and unmixed shell fluid

Research output: Contribution to journalConference articlepeer-review


A heat exchanger with one shell pass and any number of tube passes is analyzed in an operation in which the shell-side fluid is unmixed over the shell cross-section. A relation is derived between the overall effectiveness of the exchanger and the effectiveness of the segregated tube passes, in parallel flow or in counterflow. Comparison of performance of the unmixed mode with published data on mixed mode, shows the effectiveness in the unmixed exchanger to be a few percent higher The difference increases with the number of transfer units. It is shown in the unmixed operation, as it is known in the mixed mode, that the 1-3 and 1-5 exchangers with more counterflow passes out perform the exchangers arranged with an even number of tube passes.

Original languageEnglish
Pages (from-to)225-229
Number of pages5
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
StatePublished - 1 Dec 1989
EventHeat Transfer Equipment Fundamentals, Design, Applications, and Operating Problems - Philadelphia, PA, USA
Duration: 6 Aug 19899 Aug 1989

ASJC Scopus subject areas

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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