Investigation of near-critical heat transfer in rectangular microchannels with single wall heating using infrared thermography

Saad A. Jajja, Brian M. Fronk

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

This paper characterizes the thermal-hydraulic behavior of carbon dioxide near the critical point in rectangular microchannels with uniform heating limited to a single wall of the flow channel. Experiments were conducted in a horizontal, bottom heated channel with a hydraulic diameter of 923 µm and an aspect ratio (AR=[Formula Presented]) of 3.33. Experimental variables included the mass flux (430≤G≤800 kg m−2 s−1), heat flux (5.7≤q≤14.12 W cm−2), inlet temperatures (31≤Tin≤32.9 C), and a reduced pressure (PR) of 1.04. To limit the heating to a single wall of the flow channel, a novel test section was designed and built using Inconel-718, Torlon 4203, and stainless steel. Infrared thermography was used to obtain local heat transfer data. Existing supercritical heat transfer correlations, developed for uniform wall heating conditions, did not accurately predict the heat transfer for single wall heating boundary conditions.

Original languageEnglish (US)
Article number121470
JournalInternational Journal of Heat and Mass Transfer
Volume177
DOIs
StatePublished - Oct 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Fingerprint

Dive into the research topics of 'Investigation of near-critical heat transfer in rectangular microchannels with single wall heating using infrared thermography'. Together they form a unique fingerprint.

Cite this