EXPERIMENTAL EVALUATION OF CONDENSATION HEAT TRANSFER COEFFICIENT OF R-417A IN HORIZONTAL TUBES

Experimental Investigation of the Condensation Heat Transfer Coefficient of R134a inside Horizontal Smooth and Micro-Fin Tubes

The condensation heat transfer coefficient of R134a was experimentally studied inside two smooth and four micro-fin tubes. The working conditions and structural parameters of the test tubes were selected as the influencing factors, and the experiment was conducted under mass velocities of 400–1100 kg·m−2·s−1, condensation temperatures of 35–45 ◦C and water-testing Reynolds numbers of 8000–22,00...

Analysis of variance of nanofluid heat transfer data for forced convection in horizontal spirally coiled tubes

In the present study, an experimental study is carried out to investigate the effect of adding Al and Cu nanoparticles to the base fluid (water) on the heat transfer rate in a spirally coiled tube. The spirally coiled tube is fabricated from the straight copper tube with the inner and outer coil diameters of 100 and 420 mm, respectively. The experiments have been done for water and two types of...

Experimental study of convective heat transfer coefficient of MgO nanofluid in a cylindrical microchannel heat sink

Convective heat transfer of MgO-water nanofluid in a microchannel heat sink is experimentally investigated in various concentrations of 0.01, 0.05, 0.1, and 0.6 wt%. The microchannel consisted of 48 parallel rectangular cross section channels with the height of 800 µm, width of 524 µm and length of 52 mm. A well stability duration (ca. 1 month) was resulted by a 180 min ultra-sonication of the ...

Flow condensation in horizontal tubes

Article history: Received 30 April 2013 Received in revised form 20 June 2013 Accepted 20 June 2013 Available online 27 July 2013

Condensation Heat Transfer of Pure Refrigerants in Microfin Tubes