Document Type

Article

Publication Date

2019

DOI

10.1063/1.5083195

Publication Title

Physics of Fluids

Volume

31

Issue

2

Pages

023105 (1-11)

Abstract

A direct numerical simulation of single plume flow in thermal convection with polymers was carried out in a domain with 1:3 as the width to height ratio. The heat transport ability is weakened by adding polymers within the here-investigated governing parameter range. However, it is promoted when the maximum polymer extension L is increased. The distribution of vertical velocity and temperature indicates that the plume in the polymer solution case is speeded up and widens bigger as compared to that in the Newtonian fluid case. Inside the plume, polymer chains tend to release energy at the position where the velocity is decelerated. The ratio of Nusselt numbers (Nu/NuNew) shows the power-law scaling relation with the governing parameter L2/Wi in polymer solution cases, which is only applicable for moderate Wi and small L. The present study can give direct insight into the observation about plumes in turbulent thermal convection experiments. It is therefore useful for the analysis of heat transport in thermal convection with polymers.

Comments

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids Volume 31, Issue 2, 023105 and may be found at https://doi.org/10.1063/1.5083195.

Original Publication Citation

Cheng, J.-P., Cai, W.-H., Zhang, H.-N., Li, F.-C., Shen, L., & Qian, S.-Z. (2019). Numerical study on the dynamic process of single plume flow in thermal convection with polymers. Physics of Fluids, 31(2), 023105 doi:10.1063/1.5083195

Available for download on Saturday, February 22, 2020

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