Study on heat transfer and pressure drop characteristics for nanofluids in microchannel heat exchangers

The microchannel heat exchanger (MCHE) is considered the next-generation heat exchanger owing to its high-performance thermal management systems and fabrication processes. The MCHE is used in many cooling applications, such as x ray medical devices, high-power microelectronics, and high-heat flux de...

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Bibliographic Details
Published in:Physics of fluids (1994) 2023-10, Vol.35 (10)
Main Authors: Lalagi, Gururaj, Nagaraj, P. B., Talugeri, Vinayak, Bidari, Mallikarjuna Veerabhadrappa
Format: Article
Language:English
Subjects:
Aluminum oxide
Carbon nanotubes
Copper oxides
Fluid dynamics
Fluid flow
Heat exchangers
Heat flux
Heat transfer
Laminar flow
Management systems
Medical devices
Medical equipment
Microchannels
Nanofluids
Nanoparticles
Physics
Pressure drop
Reynolds number
Thermal management
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Summary:The microchannel heat exchanger (MCHE) is considered the next-generation heat exchanger owing to its high-performance thermal management systems and fabrication processes. The MCHE is used in many cooling applications, such as x ray medical devices, high-power microelectronics, and high-heat flux devices. Comprehensive exploration of different nanofluids, their concentrations, and impacts on pressure drop and heat transfer within the context of MCHEs was the main focus of the current study. The experiments were conducted at Reynolds numbers ranging from 100 to 500 for laminar flow. Additionally, nanoparticles (np) such as Al2O3, CuO, and carbon nanotubes (CNT) were added to de-ionized water at weight percentages of 0.01, 0.03, and 0.05. The results indicated that heat transfer significantly increased at a particle concentration 0.05 by wt. % for all nanofluids (nf). Furthermore, at a particle of 0.05 by wt. %, the heat transfer of the CNT-based nf increased by 37%, whereas those of the Al2O3- and CuO-based nf increased by 24.01% and 6.23%, respectively. The nanofluid pressure drop (PD) increases with an increase in the Reynolds number owing to the increase in the viscosity of the liquid compared to de-ionized water (base fluid) and requires more pumping power.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0169130