Numerical investigation of heat transfer of laminar and turbulent pulsating Al₂O₃/water nanofluid flow

Abstract

Purpose The purpose of this paper is to investigate the heat transfer of laminar and turbulent pulsating Al203/water nanofluid flow in a two-dimensional channel. In the laminar flow range, with increasing Reynolds number (Re), the velocity gradient is increased. Also, the Nusselt number (Nu) is increased, which causes increase in the overall heat transfer rate. Additionally, in the change of flow regime from laminar to turbulent, average thermal flux and pulsation range are increased. Also, the effect of different percentage of Al2O3/water nanofluid is investigated. The results show that the addition of nanofluids improve thermal performance in channel, but the using of nanofluid causes a pressure drop in the channel. Design/methodology/approach The pulsatile flow and heat transfer in a two-dimensional channel were investigated. Findings The numerical results show that the Al2O3/Water nanofluid has a significant effect on the thermal properties of the different flows (laminar and turbulent) and the average thermal flux and pulsation ranges are increased in the change of flow regime from laminar to turbulent. Also, the addition of nanofluid improves thermal performance in channels. Originality/value The originality of this work lies in proposing a numerical analysis of heat transfer of pulsating Al2O3/Water nanofluid flow -with different percentages- in the two-dimensional channel while the flow regime change from laminar to turbulent.

Exergoeconomic analysis and optimization of reverse osmosis desalination integrated with geothermal energy

“…This parameter indicates the difference between the average cost of products and fuel due to the destruction and cost of investment. In this relationship, c P, k and c F, k are respectively the average cost per unit exergy of product and fuel for the component k, and their values are obtained from Equations (12) and (13).…”

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Introduction of explicit equations for the estimation of surface tension, specific weight, and kinematic viscosity of water as a function of temperature

“…The numerical outputs indicated that the derived formulation given in Equation 6exhibited better prediction performance compared to the comparative equation-4 (CE-4) and the comparative equation-5 (CE-5). Finally, from the numerical point of view, it is also noted that some useful recent investigations can be found in the field of thermal energy storage, 19 nanofluid flow, 20,21 low-fluid pressure safety valve design, 22 heat transfer, 23 and thermal analysis. 24…”

Analogy between thermal and mass diffusion effects of a free convective flow in rectangular enclosure

“…A comparison of analytical and numerical methods of thermal analysis of rectangular cross-section porous fins enclosure was investigated by Hoseinzadeh et al [10,11]. Hoseinzadeh et al [12] have investigated numerically the heat transfer of a laminar and turbulent pulsating Al 2 O 3 /water nanofluid flow. The problem of free convective flow in a rectangular enclosure in the presence of four discrete heaters was investigated by Nithyadevi et al [13].…”