Natural convection between vertical parallel plates occurs frequently in applications such as solar collectors and cooling of electronic instruments. The problem is a two dimensional developing buoyant flow. In this work, the two dimensional conservation equations are solved numerically for constant wall temperature and constant wall heat flux. The results for the local Nusselt number at the du...

Heat transfer resulting from the natural convection in a fluid layer contained in an infinite horizontal slot bounded by solid walls and subject to a spatially periodic heating at the lower wall has been investigated. The heating produces sinusoidal temperature variations along one horizontal direction characterized by the wave number α with the amplitude expressed in terms of a suitably define...

natural convection heat transfer from a vertical heated plate in a saturated porous medium is analyzed under thermal non-equilibrium assumptions. the plate is maintained at a non uniform temperature and the fluid is considered to be with internal heat generation. the coupled momentum and energy equations for fluid and solid phases are transformed to a similarity format, and solved numerically. ...

With the continuous emergence of various advanced packaging technologies such as copper interconnection and 3-D technology, it is essential to efficiently accurately investigate thermal analysis high-performance, high-power complicated electronic devices better design heat dissipation structures. However, multiscale transient complex by existing numerical methods still a challenge. In this work...

In this study a system constituted by seven double skin facades (DSF), three equipped with venetian blinds and four not blinds, applied in virtual chamber, is developed. The project will be carried out winter conditions, using numerical model, transient based on energy mass balance linear integral equations. equations are used to calculate the air temperature inside DSF blind, inner outer glass...

This article explains a simple way to demonstrate natural convection, such as from a lit candle, in the classroom using an overhead projector. The demonstration is based on the principle of schlieren imaging, commonly used to visualize variations in density for gas flows.

There is a need for innovative educational experiences that unify and reinforce fundamental principles at the interface between the physical, chemical, and life sciences. These experiences empower and excite students by helping them recognize how interdisciplinary knowledge can be applied to develop new products and technologies that benefit society. Microfluidics offers an incredibly versatile...

The objective of our paper is to start the theoretical investigation of the most commonly used mathematical model for natural convection in a horizontal annulus. First, one shows existence of solutions for the unsteady problem. Then, for any Prandtl number and inverse relative gap width, existence and stability of a steady solution is proved, provided that the Rayleigh number is sufficiently sm...

We present experimental results for pattern formation in Rayleigh-Bénard convection of a fluid with a Prandtl number σ ≃ 4. We find that the spiraldefect-chaos (SDC) attractor which exists for σ ≃ 1 has become unstable. Gradually increasing the temperature difference ∆T from below to well above its critical value ∆Tc no longer leads to SDC. A sudden jump of ∆T from below to above ∆Tc causes con...

The role of thermodiffusive generation of concentration fluctuations via the Soret effect, their contribution to the buoyancy forces that drive convection, the advective mixing effect of the latter, and the diffusive homogenisation are compared and elucidated for oscillatory convection. Numerically obtained solutions of the field equations in the form of spatially extended relaxed traveling wav...