The influence of hybrid nanofluid and coolant flow direction on bubble mode absorption improvement

Abstract

This paper aims to study the influence of hybrid nanofluid and coolant flow direction on mass and heat transfer improvement for a bubble absorber in order to reduce the absorber length required for complete absorption. Hybrid nanofluid is used as the cooling medium. A finite difference method was used to solve the system of nonlinear differential equations. The absorber length is divided into differential elements of an incremental length dL along the absorber length. A parametric study comparing two different flow configuration (co/countercurrent coolant flow direction) of the bubble absorber was conducted to gage the influence of solid volume fraction (0% ≤ Phi ≤ 2%), direction of coolant flow, type of working fluid on heat, and mass transfer enhancement. The results show that the absorption process depends on the direction of coolant flow and the type of working medium. The absorption rate with coolant in countercurrent flow direction is higher than that cocurrent flow direction. In addition, results reveal that the heat and mass transfer, the mass absorption flux, the absorber thermal load, Stanton, and Reynolds number in binary hybrid nanofluids are enhanced more than that the binary nanofluid and NH3/H2O solution, which increase the absorption rate and consequently decrease the absorber length. The type of working medium and the solid volume fraction are the key parameters. Also results reveal that an optimal absorber length is found when using binary hybrid nanofluid as a working medium.

Free convection and thermal radiation of a nanofluid inside an inclined L‐shaped microelectronic module under the Lorentz forces' impact

“…Heat transfer performance is a very important topic due to it being present in different engineering domains like plasma manufacture, 1‐12 the improvement of thermal system performance such as solar collectors, 13 condensing and evaporating systems, 14 bubble absorber system, 15‐18 LED lamps, 19,20 heat exchanger, 21‐23 nano–encapsulated phase change materials (NEPCMs), 24‐27 and geothermal and nuclear energies. Currently, due to technological development the cooling of microelectronics devices has become a crucial topic, which attracts the interest of researchers.…”

Review of Fluidized Bed Technology Application for Adsorption Cooling and Desalination Systems

“…Ben Hamida et al pointed out that among methods enhancing absorption efficiency, the nanofluids and copper nanoparticles application enhances heat and mass transfer rates and performance of the chiller [19,20]. Ben Jaballah et al showed that the use of hybrid nanofluids and coolant flow direction can further increase the chiller's performance [21,22]. While the entire volume of the absorbtion bed is used in absorption chillers, the adsorption chillers employ surface adsorption process on to the surface of the adsorbent in the adsorption bed.…”

Significance of exponential space‐based heat source and inclined magnetic field on heat transfer of hybrid nanoliquid with homogeneous–heterogeneous chemical reactions

“…Al‐Mdallal et al 31 considered the hybrid‐nanofluids flow past a permeable surface with an inclined magnetic field. Jaballah et al 32 examined the hybrid nanofluid on bubble mode absorption improvement, and it is shown that using counter current coolant flow direction improves the absorption rate more than that the concurrent flow direction. Jaballah et al 33 considered hybrid nanofluid as a cooled absorption system.…”