Academic Journals Database
Disseminating quality controlled scientific knowledge

EXPERIMENTAL INVESTIGATIONS OF HEAT TRANSFER ENHANCEMENT FROM DIMPLED SURFACE IN A CHANNEL.

ADD TO MY LIST
 
Author(s): Sandeep S. Kore | Satishchandra V. Joshi | Narayan K.Sane

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 8;
Start page: 6227;
Date: 2011;
VIEW PDF   PDF DOWNLOAD PDF   Download PDF Original page

Keywords: Dimpled surface | channel flow | Vortex generator | heat transfer enhancement | forced convection

ABSTRACT
An experimental investigation has been carried out to study heat transfer and friction coefficient by dimpled surface. The aspect ratio of rectangular channel is kept 4:1 and Reynolds number based on hydraulic diameter is varied from 10000 to 40000. The ratios of dimple depth to dimple print diameter is varied from 0.02 to 0.04 toprovide information on the influences of dimple depth. The ratio of channel height to print diameter is 0.5. The heat transfer and friction factor data obtained is compared with the data obtained from smooth plate under similar geometric and flow conditions. It is observed that at all Reynolds number as depth increases from 0.2 to0.3, the normalised Nusselt number and thermal performance increases and then after when depth increase from 0.3 to 0.4 normalised Nusselt number and thermal performance decreases.These are because of increase in strength and intensity of vortices and associated secondary flows ejected from the dimples.
Why do you need a reservation system?      Affiliate Program