This work is aimed at presenting numerical predictions regarding unsteady natural convection in a rectangular cavity. The flow in the buoyancy-driven cavity of 7 : 1 aspect ratio is numerically analyzed for water (Pr = 3.77) which is exposed to hot and cold vertical plates with periodic temperatures. The results are obtained for three different variable Rayleigh numbers sets whose maximum value...

We consider a microfluidic molecular communication (MC) system, where the concentration-encoded molecular messages are transported via fluid flow-induced convection and diffusion, and detected by a surface-based MC receiver with ligand receptors placed at the bottom of the microfluidic channel. The overall system is a convection-diffusion-reaction system that can only be solved by numerical met...

an investigation has been carried out on the temperature of a biscuit on the cooling line of razavi food industries company. for thispurpose, the time variations of biscuit’s top surface temperature in traveling from oven to packing station on the conveyor packing station by conveyors has been studied. the fourier field equation for transient heat transfer is used as the basis for the determini...

This study presents direct numerical simulations of natural convection for air (Pr = 0.709) in a vertical channel driven by differentially heated walls at Rayleigh numbers (Ra) up to 2.0 × 107. The present data is validated with that from Versteegh and Nieuwstadt [9] for Ra = 5.0 × 106. Using the present data for higher Ra, we appraise and compare the various proposed scaling laws for the mean ...

Over the decades, the natural convection phenomenon has received considerable attention because of a variety of real-world applications. It is important to investigate time-dependent dynamics in natural convection, relying on a strong coupling between incompressible flows and heat transfers. An implicit treatment for the coupling requires for an iterative procedure while an explicit treatment i...

Thermal convection in a lid cooled cavity with phase change was studied experimentally and numerically. The ow and ice front structures, and their dependence on the ow parameters (Rayleigh number) were investigated. In the experiment, the onset of convection in an initially isothermal uid (water) in a 383838mm plexiglas box, which is instantaneously cooled from isothermal top wall to a temperat...

A theoretical analysis has been made to explore thermal entrance region heat transfer in nanofluids. The numerical model used in this paper is based on the Buongiorno model for convective heat transfer in nanofluids with modifications to fully account for the effects of nanoparticles volume fraction distributions on the continuity, momentum and energy equations. Numerical investigations have be...

The paper is devoted to the study of formation stratification in an incompressible fluid due convective laminar flows horizontal layers heated from side. Medium and intensive modes stationary thermal, concentrational thermo-concentrational (in particular thermohaline) convection are considered, which nonlinear flow features manifested, can radically change structure characteristics heat mass tr...