this paper a novel homotopy perturbation method has been presented for forced convection boundary layer problems in a porous medium. Noting the infinite condition, a homotopy form which is similar to the singular perturbation form has been considered. The inner and outer solutions have been achieved and the coincidence of the results has been investigated with a proper matching method. The resu...

Selected results of three Direct Numerical Simulations are presented, on relevant test cases for the thermal hydraulics liquid–metal-cooled nuclear reactors, encompassing a wide spectrum turbulent convection regimes. The first case is Rayleigh-Bénard cell at Grashof number Gr=5×107, representative conditions in unstably stratified layer coolant reactor pool both standard operating and emergency...

Two identical prototype solar dryers (direct and indirect) having the same dimensions were used to dry whole mint. Both prototypes were operated under natural and forced convection modes. In the case of the later one the ambient air was entered the dryer with the velocity of 4.2 m s(-1). The effect of flow mode and the type of solar dryers on the drying kinetics of whole mint were investigated....

Convection at interior surfaces significantly affects the overall heat transfer in office buildings with large glazing areas. While a large number of these office buildings utilize ceiling slot diffusers at the glazed building perimeter, convection correlations specific to these diffusers have not yet been investigated. This paper describes convection correlations developed for ceiling slot dif...

The forced convection experiment of fan plate-finned tube heat exchangers which are mainly used in air conditioners and the forced convection model have been studied for which the heat transfer effect of this type exchangers has not been proposed by a model. All measurements were made when there is no refrigerant flow in the pipe at Reynolds's number of 580. According to the experiment results,...

The use of natural convection, side-arm heat exchangers in solar domestic water heating systems is becoming a popular method of reducing system cost and electric demand. In this paper, we compare thermal performances of three natural convection heat exchangers mounted along the outside of the water storage tank and a commercial wraparound-tank heat exchanger to two forced-flow heat exchangers. ...

Abstract In this study, the ignition characteristics and flow properties of mixed convection are presented. Detailed formulations forced, natural problems have been discussed. order to avoid inconvenient switch between forced we introduce a continuous transformation in convection. We make comparison these situations which reveal good agreement. For flow, distance is explicitly expressed as func...

This paper considers an important model of boundary value problem with a condition at infinity namely combined free and forced convection over a plane of arbitrary shape embedded in a fluid-saturated porous medium; this model admits dual solutions, and uses a technique, which is to some extent modification of homotopy analysis method (HAM), in order to obtain dual solutions analytically with hi...

The numerical simulation of the horizontal solidification pure tin under natural convection and forced induced by Electromagnetic Stirring (EMS) is presented compared with experimental results obtained ‘AFRODITE’ benchmark setup, described in several previous publications [6–10]. experiment consists solidifying a rectangular ingot (100 × 10 60 mm) using two lateral heat exchangers which allow a...