Experimental study of heat transfer enhancement in an asymmetrically heated rectangular duct with perforated baffles

Experimental investigation of effect of flow attack angle on thermohydraulic performance of air flow in a rectangular channel with discrete V-pattern baffle on the heated plate

“…Karwa et al 31 experimentally studied the effect of Nusselt number in a rectangular channel with perforated or solid baffle mounted on single of the broad walls. Mousavi and Hooman 32 experimentally and numerically investigated the laminar fluid flow and heat transfer in the entrance region of a twodimensional horizontal channel with isothermal walls and with staggered baffles.…”

Performance Study of Solar Air Heater Having Absorber Plate with Half-Perforated Baffles

“…Since the boundary conditions in the studies of Karwa and coauthors [17,18] correspond closely to those found in solar air heaters, the objective of the present experimental study has been to study the effectiveness of the halfperforated baffles in the solar air heater duct in the thermal performance enhancement. Half-perforated baffles of Karwa and Maheshwari [18], as shown in Figure 1, have been used with the absorber plate of the baffled duct air heater.…”

“…This leads to a high operating temperature of the collector, especially the absorber plate, resulting in greater heat loss from the collector. Hence, the researchers have directed their efforts towards enhancement of heat transfer coefficient by creating turbulence near the heat transferring surface using artificial roughness in various forms, such as solid roughness elements of various shapes and in different arrangements and perforated or detached roughness elements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…The detached elements or elements with perforations allow a part of the flow to pass through the perforations or gap, and thus, the adverse effects of the hot zone and form drag are reduced [12][13][14][15][16][17][18]. Hwang and Liou in [14] studied the effect of the half-perforated turbulence promoters symmetrically mounted on two opposite walls on the heat transfer and friction in a rectangular channel.…”

“…Hence, elements projecting beyond the sublayer, such as baffles, may be useful. To enhance the heat transfer in an asymmetrically heated rectangular section duct, Karwa et al [17] employed solid and fully perforated baffles attached to the uniformly heated broad wall of the duct. Karwa and Maheshwari [18] carried out an experimental study of heat transfer and friction in such ducts with fully perforated (open area ratio of 46.8%) or half-perforated baffles (open area ratio of 26%) at pitch to baffle height ratio of 7.2-28.8 and flow Reynolds number of 2700 to 11150.…”