Dual convection of NEPCM inside an annulus between two circular cylinders mounted on rectangles

This paper adopts the incompressible smoothed particle hydrodynamics (ISPH) method for simulating the dual diffusion of nano-encapsulated phase change material (NEPCM) in an annulus. Here, the novelty is appearing in simulating the double diffusion of NEPCM within a novel complex shape composed from the paradigm of an annulus between two circular cylinders mounted on rectangles. The ISPH method solved the regulating equations of a physical problem. The scales of parameters are a fusion temperature hf(0.05 < hf < 0.95), buoyancy ratio (0 < N < 10), nanoparticle parameter (0.01 < u < 0.05), a radius of a circular cylinder (0.1 < ( ( rc < 0.4), Darcy parameter 10-2 < Da < 10-5), and Rayleigh's number 103 < Ra <106). The performed simulations showed that the different boundary conditions amongst an inner blockage and outer cavity walls are affecting the strength of concentration and temperature. The location of a phase change zone is varied according to the variations of variable boundary conditions and fusion temperature. The mean Nusselt and Sherwood numbers are improving under an enlarge-ment in a radius of an internal circular cylinder, and Rayleigh numbers.(c) 2023 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

Automated summary

This paper uses the ISPH method to simulate the dual diffusion of NEPCM in an annulus. The novelty lies in simulating the double diffusion within a complex shape composed of an annulus between two circular cylinders mounted on rectangles. The simulations show that different boundary conditions affect the concentration and temperature, and the position of the phase change zone varies with variable boundary conditions and fusion temperature. The mean Nusselt and Sherwood numbers improve with an increase in the radius of the internal circular cylinder and Rayleigh numbers.