Heat transfer characteristics of three interacting methane/air flame jets impinging on a flat surface

Investigation of flow structure and heat transfer characteristics in an array of impinging slot jets

“…Koopman and Sparrow [10] studied a row of impinging air jets and concluded that a higher local heat transfer coefficient was obtained in the middle between adjacent jets owing to the collision of their spreading flows. Chander and Ray [11] conducted an experimental study for three interacting methane/air flame jets (arranged in a triangular configuration) impinging normally on a flat surface. Pan and Webb [12] studied local heat transfer details of the circular jet array impingement.…”

Heat transfer distribution for three interacting methane–air premixed impinging flame jets

“…Studies on numerical investigation are reported in the work of Conolly and Davies [7], Som et al [8], Chander and Ray [9] and Remie et al [6]. Different burner geometries (employing single and multiple jets) have been used, the inverse diffusion flame (IDF) burners have been employed by Dong et al [10][11][12][13][14] and burners with induced swirl by Huang et al [15], Chander and Ray [16,17] and Singh et al [18]. Following conclusions are drawn from the literature.…”

“…(i) The heat transfer distribution depends strongly on the nozzle-plate spacing, Reynolds number , shape of the burner, equivalence ratio, oxygen enhancement [19], jet incidence angle [25] and inter-jet spacing [14,16]. (ii) The surface characteristic of the impingement plate does not have significant effect on the impingement heat transfer characteristics [21].…”

“…Flame impinging normal to plate has the highest efficiency and lowest heating time [25]. For multiple jets with equilateral triangle arrangement, the heat flux at stagnation point decreases with increase in the inter-jet spacing and the peak heat flux shifts farther away from the stagnation point [16]. For pure methane-oxygen flames, the equilibrium thermochemical heat release parameter (TCHR) is as high as 1.6 to 3.0 for different surface temperatures which implies that more than 50% of the heat transfer is by TCHR [23].…”

A numerical study of heat transfer performance of oscillatory impinging jets

“…1. Counter rotating vortices form in the secondary stagnation region [7,8] hindering the local heat transfer. As a result, the Nusselt number takes the minimum value at the secondary stagnation point.…”