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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017004536
pages 1007-1024

LAMINAR PULSATING CONFINED JET FLOW OF NANOFLUIDS IN A DUCT WITH ISOFLUX WALL

M. Rahgoshay
School of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
Ali Akbar Ranjbar
School of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
Abas Ramiar
School of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
M. Rahimi
School of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
A. Arya
School of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran

SINOPSIS

Pulsating flows have a potential for research in many aspects. A pulsating unsteady confined jet is still unclear and requires further investigation because of many upcoming applications. In the past decade, nanofluids have attracted much interest because of their reported superior thermal performance and many potential applications. Also, a pulsating confined jet in a nanofluid is a new idea in fluid mechanics and heat transfer. In this paper, two-dimensional pulsating confined jet flow of nanofluids through a duct with isoflux walls is investigated numerically. In order to solve the Navier−Stokes and energy equations, the finite volume approach with collocated grid is employed. The momentum interpolation technique of Rhie and Chow is applied in SIMPLE algorithm. The simulation is performed at different pulse parameters (amplitude, Strouhal and Reynolds numbers) and volume fractions of nanoparticles for unsteady flow and also various values of the duct-to-jet width ratio (aspect ratio). Increasing both the frequency and amplitude leads to a slight increase in the Nusselt number but by increasing the Reynolds number, aspect ratio, and volume fraction the average Nusselt number will increase more. By increasing the Reynolds number and volume fraction, a higher rate of heat transfer is observed. The authors have not found in the open literature any records similar to the present work. One of the advantages of using pulsation in a nanofluid is a delay in the sedimentation process of nanoparticles.