Review of pool boiling enhancement by surface modification

Numerical study of double-diffusive natural convection in a square cavity

A brief review of natural convection in enclosures under localized heating with and without nanofluids

A three-dimensional numerical study has been performed to investigate double-diffusive, natural convection in a cubic enclosure subject to opposing and horizontal gradients of heat and solute. The flow is driven by buoyancy forces due to temperature and solutal gradients. Constant temperature and concentration are imposed along the two vertical side walls of the cubic enclosure, while the remaining walls are impermeable and adiabatic. The numerical simulations presented here span a wide range of thermal Rayleigh number (10.0<Ra<2×105), buoyancy ratio (−2.0<N<0) and Lewis number (0.1<Le<150) to identify the different flow patterns and bifurcations. Nusselt and Sherwood numbers are presented as functions of the governing parameters. Most of the published results approximate the problem as two dimensional. In the present results we indicate that the double diffusive flow in enclosures with opposing buoyancy forces is strictly three dimensional for a certain range of parameters.

Double diffusive convection in a cubic enclosure with opposing temperature and concentration gradients

The buoyancy-driven fluid flow and heat transfer in a square cavity with partially active side walls filled with Cu–water nanofluid is investigated numerically. The active parts of the left and the right side walls of the cavity are maintained at temperatures T h and T c , respectively, with T h > T c . The enclosure’s top and bottom walls as well as the inactive parts of its side walls are kept insulated. The governing equations in the two-dimensional space are discretized using the control volume method. A proper upwinding scheme is employed to obtain stabilized solutions. Using the developed code, a parametric study is undertaken, and the effects of the Rayleigh number, the locations of the active parts of the side walls, and the volume fraction of the nanoparticles on the fluid flow and heat transfer inside the cavity are investigated. It is observed from the results that the average Nusselt number increases with increasing both the Rayleigh number and the volume fraction of the nanoparticles. Moreover, the maximum average Nusselt number for the high and the low Rayleigh numbers occur for the bottom–middle and the middle–middle locations of the thermally active parts, respectively.

Natural convection of Cu–water nanofluid in a cavity with partially active side walls

Natural convection in a rectangular cavity with partially active side walls

Natural convection in confined fluids with combined horizontal temperature and concentration gradients

Confined natural convection due to lateral heating in a stably stratified solution

Critical heat flux enhancement of pool boiling with adaptive fraction control of patterned wettability

Study of transporting of droplets on heterogeneous surface structure using the lattice Boltzmann approach

Jung Shin Lee

Papers

Natural convection in a rectangular cavity with partially active side walls

Natural convection in confined fluids with combined horizontal temperature and concentration gradients

Confined natural convection due to lateral heating in a stably stratified solution

Critical heat flux enhancement of pool boiling with adaptive fraction control of patterned wettability

Study of transporting of droplets on heterogeneous surface structure using the lattice Boltzmann approach