Heat transport in two-phase vertical natural convection using an Euler–Lagrange approach

C. S. Ng, V. Spandan, D. Lohse, R. Verzicco

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Abstract

We present numerical results of dispersed droplets in vertical natural convection (VNC) flow, which is a buoyancy driven flow between differentially heated vertical walls. Our focus is to study the effects of droplets on the local statistics of heat transport in natural convection, where heat transport enhancement due to bubbles has recently been reported [5]. Our numerical simulations are fully-resolved and based on an Euler–Lagrange approach with two phases: the first is the carrier phase (liquid), which is solved by a second-order accurate finite-difference scheme and marched in time using a fractional-step approach; the second is the dispersed phase (droplets) that are much larger than the Kolmogorov length scale. The interfacial droplet boundaries and deformations are modelled by an immersed boundary method and an interaction potential approach, respectively. We show that the heat flux is slightly enhanced for the Rayleigh number range 1.3×108–2.3×109 and Prandtl number of 7, which can be attributed to droplet induced mixing.

Original languageEnglish
Title of host publicationProceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018
EditorsTimothy C.W. Lau, Richard M. Kelso
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9780646597843
Publication statusPublished - 1 Jan 2018
Event21st Australasian Fluid Mechanics Conference, AFMC 2018 - Adelaide Convention Centre, Adelaide, Australia
Duration: 10 Dec 201813 Dec 2018
Conference number: 21

Conference

Conference21st Australasian Fluid Mechanics Conference, AFMC 2018
Abbreviated titleAFMC 2018
CountryAustralia
CityAdelaide
Period10/12/1813/12/18

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Ng, C. S., Spandan, V., Lohse, D., & Verzicco, R. (2018). Heat transport in two-phase vertical natural convection using an Euler–Lagrange approach. In T. C. W. Lau, & R. M. Kelso (Eds.), Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018 Australasian Fluid Mechanics Society.