Thermohydraulic performance of solar air heaters with roughened absorber plates

http://amet-me.mnsu.edu/UserFilesShared/SolarWall/Technical%20Papers%20and%20%20Documents/Flat%20Plate%20Collector/Experimental%20investigation%20on%20heat-transfer%20enhancement%20due%20to%20a%20gap%20in%20an%20inclined%20continuous%20rib...%20-%20Aharwal,Gandhi,Saini.pdf

Experimental investigation on heat-transfer enhancement due to a gap in an inclined continuous rib arrangement in a rectangular duct of solar air heater

Investigation for the optimal thermohydraulic performance of artificially roughened solar air heaters

The conversion, utilization and recovery of energy invariably involve a heat exchange process, which makes it imperative to design more efficient heat exchanger. The use of artificial roughness in different forms, shapes and sizes is the most common and effective way to improve the performance of a solar air heater. Several studies have been carried out to determine the effect of different roughness element geometries on heat transfer and friction in solar air heaters. This study reviews various roughness element geometries employed in solar air heaters for performance enhancement. Based on the correlations of heat transfer and friction factor developed by various investigators, an attempt has been made to compare the thermohydraulic performance of roughened solar air heaters.

Performance of artificially roughened solar air heaters—A review

Experimental investigation on heat transfer and fluid flow characteristics of air flow in a rectangular duct with Multi v-shaped rib with gap roughness on the heated plate

Optimising the thermohydraulic performance of rough surfaces

A model of the RESET melting process in conventional phase-change memory (PCM) devices is constructed in which the Gibbs–Thomson (GT) effect, representing local equilibrium at the solid–liquid interface, is included as an interfacial condition for the electro-thermal model of the PCM device. A comparison is made between the GT model and a commonly used model in which the interfacial temperature is fixed at the bulk melting temperature of the PCM material. The model is applied to conventional PCM designs in which a dome-shaped liquid/amorphous region is formed. Two families of solutions are computed representing steady state liquid regions, distinguished by their thermodynamic aspects. There is a family of solutions representing a hypothetical liquid nucleation process, and a family of larger steady-state liquid solutions representing the limit of the melting process. These ‘melting limits’ enable calculation of minima in voltage and corresponding current required for the RESET process. In this PCM configuration, the GT effect constrains the equilibrium solid–liquid interface temperature to remain above the bulk melting temperature during melting. The magnitude of this temperature difference increases with decreasing device size scale, thus requiring an increase in the required voltage and current needed for RESET compared to the case in which the interface temperature is approximated by the bulk melting temperature. This increase becomes substantial for active device dimensions in the <20 nm range. The impact of this phenomena on PCM device design is discussed.

M.J. Lewis

Papers

Optimising the thermohydraulic performance of rough surfaces

Impact of solid–liquid interfacial thermodynamics on phase-change memory RESET scaling