In the present research, the laminar forced convective heat transfer and fluid flow characteristics for Al2O3-water nanofluid flowing in different bend (i.e., 180o and 90o) pipes have been investigated numerically in a three-dimensional computational domain using the finite volume technique. The effects of different pertinent parameters, such as the Reynolds number of the duct, volume fraction ...

A multi-parametric transient numerical simulation of the start-up a large diameter Pulsating Heat Pipe (PHP) specially designed for future experiments on International Space Station (ISS) are compared to results obtained during parabolic flight campaign supported by European Agency. Since channel is larger than capillary limit in normal gravity, such device behaves as loop thermosyphon ground a...

one way to increase the heat transfer is to use perforated twisted tapes with different hole diameters, which largely improve heat transfer with an increase in the heat transfer area at the constant volume and more mixed flow. in the previous studies, the effect of nanofluids with perforated twisted tapes is less studied. in this work, the performance of water / iron oxide nanofluid in a double...

Vibrations have attracted much attention as an effective method for enhancing heat transfer in pulsating pipes (PHPs). This study mainly investigates and explores the effects of local low-frequency vibrations on starting-up characteristics a PHP. The temperature average temperatures along evaporation section pipe were experimentally scrutinized, with thermal performance, under evaporation, cond...