Optimum wall-to-wall spacing in solar chimney shaped channels in natural convection by numerical investigation

Radiation effects on natural convection in a vertical channel with an auxiliary plate

“…16, a comparison between the Nusselt number value from experimental data and the Nusselt number values calculated by the correlation in Eqs. (20) and (21) are reported together with an error level of ±10% and 20%. In addition, simple monomial equations are proposed to correlate the dimensionless maximum wall temperature to the global channel Rayleigh number and the h/L ratio.…”

Numerical investigation of transient natural convection in a vertical channel-chimney system symmetrically heated at uniform heat flux

“…The reservoirs are employed in order to simulate thermal and fluid dynamic behaviors far away from the inflow and outflow regions. The geometry studied in this numerical investigation is important in different applications, such as in electronic cooling [9,[11][12][13][14]18,23,24,27] and in building ventilation and houses solar components [8,10,11,16,17,[31][32][33]. The main differences between the present investigation and the study in reference [19] is the considered geometrical configuration.…”

“…The need to improve heat transfer in natural convection explains the reason behind the discovery of find new configurations or to analyze standard configurations to carry out optimal geometrical parameters for a higher heat transfer rate and transient behaviors for a suitable thermal design [2,[6][7][8][9][10][11][12][13][14][15][16][17][18][19]. A very simple method, which allows for improvement of the chimney effect and consequently heat transfer rate in vertical channels and other configurations, is that of placing parallel adiabatic extensions downstream heated configurations [20].…”

A numerical investigation of buoyancy induced turbulent air flow in an inclined passive wall solar chimney for natural ventilation

“…In the previous investigations (see for example [1][2]9]), solar heating on the absorber wall has been modelled as either isoflux heating or isothermal heating. We believe solar heating is better modelled by isoflux heating so as to better represent the field situation, in which the solar flux after transmitting through the glazing is absorbed by the absorber wall whose temperature is usually unknown.…”