Numerical Study of Mixed Convection in an Isosceles Trapezoidal Cavity with Several Outlets: Application for Primary Air Draft in ASUTO Charcoal Stove
Open Access
- 1 January 2022
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Modern Mechanical Engineering
- Vol. 12 (02), 45-61
- https://doi.org/10.4236/mme.2022.122003
Abstract
Mixed convection of heat and mass transfer in an isosceles trapezoidal cavity has been studied numerically. Constant heat flux is imposed through four outlets and the grid is insulated. The inclined walls are maintained in natural convection while the lower horizontal wall is adiabatic. These conditions reflect the air draft zone of the ASUTO charcoal stove. The governing two-di- mensional flow equations have been solved by using the finite difference method and Thomas’s algorithm. The investigations are conducted for different values of Richardson (Ri), Reynolds number (Re) and inclination angles of sidewalls. The results are presented in terms of streamlines, isotherms, moisture contours. It was found that for Reynolds number (Re) equal to 100, the flow pattern is strongly dependent on the inclination angle and Richardson number. Thus, for high Richardson number (Ri) values (10, 100), the dominance of natural convection over the flow structure decreases with the decreasing of the inclination angle of sidewalls of the cavity. For Ri = 1, an optimum air draft corresponds to an inclination angle in the vicinity of 22° while for Ri = 10 or 100 (in dominance of natural convection), the optimum inclination angle for air draft is in the vicinity of 15°.Keywords
This publication has 19 references indexed in Scilit:
- A simplified model for understanding natural convection driven biomass cooking stoves—Part 2: With cook piece operation and the dimensionless formEnergy for Sustainable Development, 2011
- A simplified model for understanding natural convection driven biomass cooking stoves—Part 1: Setup and baseline validationEnergy for Sustainable Development, 2011
- Fuel use and emissions performance of fifty cooking stoves in the laboratory and related benchmarks of performanceEnergy for Sustainable Development, 2010
- The Influence of Baffles on the Natural Convection in Trapezoidal CavitiesNumerical Heat Transfer, Part A: Applications, 2010
- Numerical analysis of natural convection heat transfer from rectangular shrouded fin arrays on a horizontal surfaceInternational Communications in Heat and Mass Transfer, 2008
- MIXED CONVECTION IN CAVITIES WITH A LOCALLY HEATED LOWER WALL AND MOVING SIDEWALLSNumerical Heat Transfer, Part A: Applications, 2000
- NATURAL CONVECTION IN TRAPEZOIDAL CAVITIES WITH BAFFLES MOUNTED ON THE UPPER INCLINED SURFACESNumerical Heat Transfer, Part A: Applications, 2000
- Convection naturelle de chaleur et de masse dans une cavité trapézoïdaleInternational Journal of Thermal Sciences, 1999
- Experimental and Numerical Studies of Natural Convection in Trapezoidal CavitiesJournal of Heat Transfer, 1989
- NUMERICAL ANALYSIS OF LAMINAR NATURAL CONVECTION BETWEEN CONCENTRIC AND ECCENTRIC CYLINDERSNumerical Heat Transfer, 1981