Experimental investigation of pressure drop and heat transfer in minichannel with smooth and pin fin surfaces

Mohamed Daadoua, Bobby Mathew, Fadi Alnaimat

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates pressure drop and heat transfer characteristics in a minichannel heat exchanger experimentally. The experimental testing was carried out on a minichannel with a hydraulic diameter of about 2.5 mm, with smooth and embedded with circular pin-fins. The testing was conducted with different hot fluids, air and water, over different Reynolds numbers ranges, and over different heat capacity ratios (0.25, 0.5, 0.75, and 1). The experimental study of the pressure drop covers a Reynolds number range between 100-1900 for the hot water, and Reynolds number range between 500-10,000 for the hot air. The hot fluid flows through a channel with an inline arrangement with a 1750 pin fin, while the cold fluid flows through a smooth channel. Increasing flow rates resulted in an increase in pressure drop and heat transfer coefficients. When using pin-fins surface instead of smooth surface, the overall heat transfer coefficient (U) increased by 190% when water is used as the heat transfer fluid (HTF), and the same coefficient increased by 42% when air is used as the heat transfer fluid. Similarly, the difference in pressure drop is low in the case of water-water, while in the case of air-water, the difference in pressure drop is more substantial as Reynolds number increases.

Original languageEnglish
Article number100542
JournalInternational Journal of Thermofluids
Volume21
DOIs
Publication statusPublished - Feb 2024

Keywords

  • heat exchanger
  • minichannel
  • pin-fins heat exchanger, enhanced heat transfer

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Experimental investigation of pressure drop and heat transfer in minichannel with smooth and pin fin surfaces'. Together they form a unique fingerprint.

Cite this