Developing laminar free convection between vertical flat plates with asymmetric heating

Aung, Win; Fletcher, L. S.; Sernas, V.

doi:10.1016/0017-9310(72)90048-8

Cited by 301 publications

(124 citation statements)

References 8 publications

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“…The present numerical results are produced for an aspect ratio of H/w=50. To validate the baseline numerical solutions, results were compared to the experimental data of Aung et al [10]. In which is within 8% of the measured value of 4.27, reported in reference [10].…”

Section: Holding R Ik Constant: "The Fix"mentioning

confidence: 74%

Resistor-Network Formulation of Multitemperature Free-Convection Problems

Foroushani

Wright

Naylor

2017

Journal of Thermophysics and Heat Transfer

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In recent work, the resistor-network formulation of forced convection problems and a technique, dQdT, for evaluating the paired convective resistances that characterize the network were presented. This technique entails solutions of the energy equation with perturbed boundary conditions. The resistor-network approach is particularly advantageous for multi-temperature convection problems in that it reveals the split of heat transfer between the different sources. In the present paper, the dQdT technique is extended to free

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Section: Holding R Ik Constant: "The Fix"mentioning

confidence: 74%

Resistor-Network Formulation of Multitemperature Free-Convection Problems

Foroushani

Wright

Naylor

2017

Journal of Thermophysics and Heat Transfer

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“…However, for high Rayleigh number, a boundary layer is observed near the heated wall; the fluid simultaneously enters from below and exits through the top of the channel via a reversed flow along the unheated wall. Aung et al (1972) highlighted also two regimes in a numerical study concerning a natural convection induced flow in a channel heated symmetrically or asymmetrically: the first is developed at low Rayleigh numbers and the second is of boundary layer type for high Rayleigh numbers. Azevedo and Sparrow (1986) interested in the heat transfer intensification in natural convection flows in a vertical plane channel by studying the influence of the opening on the unheated wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Double Skin With Secondary Ventilation Flow on Adiabatic Wall

Polidori¹,

Abidi-Saad²,

Bouraoui³

et al. 2017

Frontiers in Heat and Mass Transfer

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Study concerning a double skin flow with secondary ventilation was conducted numerically, in order to understand the basic mechanisms of the free convection in an open channel asymmetrically heated with uniform heat flux density (510 W/m 2 ). The vertical channel corresponds to a double skin façade, which was immersed in a tank filled with water. The tank corresponds to the environment which allows us to overcome pressure conditions at the inlet and the outlet of the channel. The use of water allows neglecting radiation effect. The mass conservation equations of momentum and energy are solved using the finite volume method and numerical simulations are performed using Ansys Fluent CFD software. Our interest, in this work, is the study of the influence of the position and the size of an opening in the adiabatic wall, which represents secondary ventilation, on the flow dynamics and the heat transfer.

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“…Thus, the practicality of basic Schlieren imaging entails more than mere visualization -it also allows for distance and location identification in fluid flow. Another study conducted by Aung, Fletcher, and Sernas (Aung et al, 1972) investigated laminar natural convection between vertical flat plates with asymmetric heating conditions. Fringe patterns from Schlieren interferometer imaging, a closely related method to Schlieren imaging, yielded nearly identical local Nusselt numbers as numerical solutions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Natural Convection in a Rectangle Using Schlieren Imaging

Doherty¹,

Dillon²,

Roberts³

2017

Frontiers in Heat and Mass Transfer

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The onset of turbulence in natural convection systems is difficult to predict using traditional computational techniques. The flow patterns that occur before and after the onset of turbulence may be better understood with the help of visual techniques like Schlieren imaging. Schlieren imaging allows visualization of the density gradients of a fluid using collimated light and refractive properties. In this experiment, a device was designed to test the behavior of airflow with non-isothermal boundary conditions within a rectangular cavity. Previous computational fluid modeling suggested a period doubling route to chaos in a cavity with a high aspect ratio and free convection flow driven by two non-isothermal walls. To visualize this system, two strip heaters were attached to two 56 cm long plates. The plates were set to an aspect ratio of 10 and sealed with gaskets and garolite. With a Z-type Schlieren device, the existence of two definitive cells was confirmed, and the oscillation point between the two cells was found above the cavity midpoint. At steady state, a thin-wire thermocouple was placed at the inflection point to measure fluctuations in temperature. Consistent oscillations in temperature were observed that indicated a steady interacting boundary layer, while non-periodic oscillations indicated the initial transition to turbulence. It was observed that there was a transition from a mostly steady interacting boundary layer at set-point 35 o C to near-turbulence at 65 o C. At higher Rayleigh numbers the transition behavior predicted in the computational fluid model was confirmed, although the size of the convection cells was not uniform.

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Developing laminar free convection between vertical flat plates with asymmetric heating

Cited by 301 publications

References 8 publications

Resistor-Network Formulation of Multitemperature Free-Convection Problems

Resistor-Network Formulation of Multitemperature Free-Convection Problems

Numerical Simulation of a Double Skin With Secondary Ventilation Flow on Adiabatic Wall

Experimental Validation of Natural Convection in a Rectangle Using Schlieren Imaging

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