Characteristics of flow distribution in compact parallel flow heat exchangers, part I: Typical inlet header

Chi-Chuan Wang, Kai Shing Yang, Jhong Syuan Tsai, Ing Youn Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

64 Scopus citations

Abstract

This study experimentally and numerically investigates the single-phase flow into parallel flow heat exchangers with inlet and outlet rectangular headers having square cross section and 9 circular tubes. The effects of inlet flow condition, tube diameter, header size, area ratio, flow directions (Z and U-type), as well as the gravity are investigated. The experimental results indicate that flow distribution for U-type flow is more uniform than Z-type flow. Depending on the inlet volumetric flow rate, the flow ratio at the first several tubes can be lower than 50% of the last tube for Z-type arrangement, and this phenomenon becomes more and more pronounced with the rising velocity at the intake conduit. The mal-distribution can be eased via reducing the branching tube size or increasing the entrance settling distance at the intake conduit. It is found that the influence of gravity on mal-distribution is negligible and the mal-distribution is associated with the jet flow pattern.

Original languageEnglish
Pages (from-to)3226-3234
Number of pages9
JournalApplied Thermal Engineering
Volume31
Issue number16
DOIs
StatePublished - 1 Nov 2011

Keywords

  • Flow distribution
  • Header
  • Parallel flow heat exchangers

Fingerprint Dive into the research topics of 'Characteristics of flow distribution in compact parallel flow heat exchangers, part I: Typical inlet header'. Together they form a unique fingerprint.

  • Cite this