Turbulent heat transfer, pressure drop and fin efficiency in annular regions with continuous longitudinal rectangular fins

Heat transfer in a reciprocating curved square duct fitted with longitudinal ribs

“…The combined inertial, centrifugal and reciprocating force-effects along with buoyancy interaction have caused the reciprocating-to-static Nusselt number ratios to fall in the range of 0.6-1.15. In the pursuit of heat transfer enhancements for piston cooling systems, several elements of surface roughness such as fins [4][5][6][7], twisted tape [8], ribs [9,10] and scales [11] are applicable for the forced-convective cooling configuration depicted in Fig. 1.…”

“…Longitudinal fins in ducts with a variety of profiles such as rectangular, triangular, parabolic and undulated profiles are readily to fit in the curved piston cooling passage. Factors concerning the fin conductance, the extended heat transfer surface and the convective condition determined by fin profiles are inter-correlated to affect the heat transfer effectiveness of the longitudinal fin in a static duct [4][5][6][7]. Applying this heat transfer enhancing measure for piston cooling needs to consider the effects of reciprocation on thermal-fluid phenomena in the enhanced cooling passage and therefore on the problem of optimizing fin configurations.…”

“…2(b), the curved square test channel is constructed by assembling four 20 mm thick Teflon plates (1)-(4). Two curved Teflon plates (1)(2) are sandwiched between two 500×600 mm rectangular Teflon plates (3)(4) to form a 20 × 20 mm square- sectioned curved channel (5). Along the centerline of the curved channel on the surfaces of Teflon plates (3)(4), a 2 × 2 mm square-sectioned longitudinal rib (6) is milled on the surface of each Teflon plates (3)(4).…”

Performance investigation of compound parabolic collector system with triangular receiver with and without internal fins

“…The experimentation was performed to evaluate heat transfer coefficient and pressure drop through annual duct with rectangular fins [8]. The heat transfer coefficient improves by inserting passive element in the flow path [9].…”

“…The increase in average thermal efficiency varies from 33.0 to 42.9 % with 0.50 to 0.75 kg/sec mass flow rate for square and Y fin. However, the average thermal efficiency varies from 29 8. to 34.8 % with 0.50 to 1650004-11 Int.…”