Investigation on the effect of using vortex generator in the flow path of combustion product in the chimney of a natural gas wall-mounted water heater on flow hydrodynamics and improving heat transfer

Document Type : Original Article

Authors

• H. Poorhoseini
• Mojtaba Baghban

Department of Mechanical Engineering, University of Gonabad, Gonabad, Iran.

10.22067/jacsm.2024.85997.1231

Abstract

In this study, the effect of using vortex generators in the form of semicircular plates with different angles and at different longitudinal distances in the chimney of a laboratory furnace with natural gas fuel on the hydrodynamics of the flow and the rate of heat transfer from combustion products has been investigated experimentally and numerically. The investigated parameters were angles for blades and the number of blades. The results show that vortex generators with reducing the speed in the central area of the chimney and increasing the residence time of the combustion products and also by directing the flow towards the boundary layer adjacent to the wall, increases the heat transfer to the chimney. The angle of 55º and the number of blades 7 was the optimum condition that prevents the flow of exhaust gases from returning, and in this case, by changing the gas flow rate in the range of 0.5 to 0.75 m3/hr, the heat transfer to the chimney wall increases by 21% on average.

Keywords

• Vortex generator
• Combustion products
• Chimney
• Heat transfer enhancement
• Blade angle
• Number of blades

Main Subjects

• Heat transfer

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