Year: 2015
Type: article
Abstract: In the present paper an experimental investigations is carried out to evaluate the enhancement of heat transfer from U-longitudinal finned tube heat exchanger with nanofluids. Laboratory experimental test rig was designed and built up to carried out the experiments. Four U-longitudinal fins are manufactured from 1mm copper sheet with 100cm long and 3.8cm height. Fins are welded with straight copper tube of 100cm length, 2.2cm inner diameter, and 2.39cm outer diameter. The straight tube with fins is fixed inside an insulated galvanized tube with 15cm inner diameter. Two types of nanoparticles (Al2O3 and TiO2) having (<80nm and 10 to 25nm) diameter respectively. Nanoparticles mixing in de-ionized water with (0.2%, 0.4%, 0.6%, and 0.8%) volume concentration. The flow through finned tube was studied at Reynolds number ranging from (270 to 1900). Air with turbulent flow is used as a cooling medium passes through the annuli. Results show that the thermal conductivity and heat transfer coefficient are affected more when using alumina-nanofluid. There is an optimum concentration for nanofluids in which more enhancements available. The optimum concentration is 0.6%.The comparison between present results and references showed good agreement.
Source: Advances in Energy and Power
Institution: Mustansiriyah University
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W581948367