Heat transfer enhancement of natural convection with ribs

Abstract

Natural convection heat transfer is found in many industrial applications such as nuclear technologies, electronic circuit board cooling, solar panel cooling and many other fields. When natural convection heat transfer coefficients are insufficient, passive heat transfer enhancement devices (called ribs/fins) are often used. In this paper, the effect of periodic patterns of protrusions (ribs) on the free-convection heat transfer of a vertical plate, with a uniform heat flux rate boundary condition, is experimentally investigated. The convective fluid is air. Two-dimensional, high resolution heat transfer measurements are performed by using infrared thermography and the heated thin foil technique. Experiments are performed on two types of ribs pattern topology: single or two staggered rows of ribs inclined at different angles and single or two-staggered rows of V-ribs

Investigation of maximum Nusselt number with inclined and non-confined offset jet impingement cooling

“…To avoid buckling of target plate, the provision is made to tighten the foil using tightening arrangement available with housing of target plate. [25][26]. The housing is made up so as to position the target plate as per required location of jet.…”

IR Experimental investigation on twin synthetic impinging jets heat transfer behaviour

“…The electrical contact between bus bars and foil is enhanced by putting there an indium wire (about 1mm in diameter). Furthermore, the foil thermal expansion is balanced by the spring-loaded bolts linked to the bus bars and by two spring-loaded insulators [15]. This foil is heated by passing an electric current through it.…”

Enhancement of Thermal Efficiency by Using Hemispherical Protrusions on Solar Air Heaters

“…On the other hand, the pressure drop in the air caused by friction with a porous medium was not negligible, and this was studied using the second-law analysis (Languri et al, 2011). Imbriale et al (2012) investigated the effect of periodic patterns of protrusions (ribs) on the free-convection heat transfer of a vertical plate, with a uniform heat-fl ux rate boundary condition. Air was considered as a convective fl uid.…”

“…Two-dimensional, high resolution heat transfer measurements were performed by using an infrared thermograph and the heated thin foil technique. Experiments were performed on two types of ribs pattern topology: single or two staggered rows of ribs inclined at different angles and single or two-staggered rows of V-ribs (Imbriale et al, 2012). Bharadwaj et al (2012) carried out experiments to determine the effect of an equilateral triangular solar air heater duct on the heat transfer and friction characteristics using inclined continuous ribs as roughness elements on the absorber plate.…”