Investigation of impingement heat transfer for air-sand mixture flow

Mustafa J. Al-Dulaimi, Adnan A. A. R. Rasool, Faik Hamad

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Abstract

Heat transfer between a heated flat plate and normal impinging gas-solid two-phase jet flow has been investigated. A single jet from a nozzle of 10 mm diameter at nozzle-to-plate distance/nozzle diameter in the range of 2 to 8 was used. Natural sand particles with average diameters of 220, 350 and 550 μm are used as a solid phase. The effect of particle size and loading ratio (mass of sand/ mass of air) at different jet velocities on impingement cooling characteristics of flat plate are investigated. The numerical simulations are performed with the ANSYS Fluent 14.7 for steady, three-dimensional, incompressible turbulent flow using Eulerian simulation for gas phase and Lagrangian simulation for sand particles. The
experimental results show that the existence of sand particles decreases the Nusselt number compared to air jet flow. The single and two-phase flow experimental results are compared well with predictions when the particle reflection option is used in the simulation. The discrepancy in the local values near the stagnation point can be attributed to the complex nature of the two-phase flow at the stagnation point that includes reflection of sand particles at different angles.
Original languageEnglish
Pages (from-to)134-141
JournalThe Canadian Journal of Chemical Engineering
Volume94
Issue number1
DOIs
Publication statusAccepted/In press - 10 Apr 2015

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