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Heat transfer and friction factor correlations for a duct having dimple-shape artificial roughness for solar air heaters

Saini, R.P.; Verma, Jitendra - In: Energy 33 (2008) 8, pp. 1277-1287

The heat transfer coefficient between the absorber plate and air can be considerably increased by using artificial roughness on the underside of the absorber plate of a solar air heater duct. Under the present work, an experimental study has been carried out to investigate the effect of...

Persistent link: https://www.econbiz.de/10010808300

A review on methodology of artificial roughness used in duct of solar air heaters

Bhushan, Brij; Singh, Ranjit - In: Energy 35 (2010) 1, pp. 202-212

In order to enhance rate of heat transfer to flowing air in the duct of a solar air heater, artificially roughened surface of absorber plate is considered to be an effective technique. Investigators reported various roughness geometries in literature for studying heat transfer and friction...

Persistent link: https://www.econbiz.de/10010808656

Development of correlations for Nusselt number and friction factor for solar air heater with roughened duct having multi v-shaped with gap rib as artificial roughness

Kumar, Anil; Saini, R.P.; Saini, J.S. - In: Renewable Energy 58 (2013) C, pp. 151-163

rectangular ducts having multi v-shaped rib with gap roughness on one broad wall. The investigation encompassed Reynolds number ….37 times of that of the smooth duct. The rib parameters corresponding to maximum increase in Nu and f were Gd/Lv=0.69, g/e=1 … function of roughness parameters of multi v-shaped with gap rib and flow Reynolds number. …

Persistent link: https://www.econbiz.de/10011046070

Heat transfer mechanism and energy efficiency of artificially roughened solar air heaters—A review

Patil, Anil Kumar - In: Renewable and Sustainable Energy Reviews 42 (2015) C, pp. 681-689

and heat transfer mechanism in case of different rib geometries has been expatiated based on available literature …

Persistent link: https://www.econbiz.de/10011117079

A review of forced convection heat transfer enhancement and hydrodynamic characteristics of a nanofluid

Hussein, Adnan M.; Sharma, K.V.; Bakar, R.A.; Kadirgama, K. - In: Renewable and Sustainable Energy Reviews 29 (2014) C, pp. 734-743

The low thermal properties of liquids have led to investigations into additives of small size (less than 100nm solid particles) to enhance their heat transfer properties and hydrodynamic flow. To summarise the experimental and numerical studies, this paper reviews these computational simulations...

Persistent link: https://www.econbiz.de/10010719451