Naslov
Experimental testing of the heat exchanger with star-shaped fins

Autori
Bošnjaković, Mladen ; Muhič, Simon ; Čikić, Ante

Izvornik
International journal of heat and mass transfer (0017-9310) 149 (2020); 119190, 12

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
heat exchanger ; experimental testing ; enhanced heat transfer ; star-shaped fin

Sažetak
Increase of the heat flow rate by applying finned surfaces is common in gas-liquid heat exchangers. Thereby, devices with annular fins are frequently used. Demands for higher capacity lead to size and mass increase of heat exchangers which over time becomes a significant problem, especially if the appli- cation of stainless steel is required. The solution to this problem is in a more efficient heat exchange on the gas side. This paper analyses the application of stainless steel star-shaped fins which increase the turbulence of fluid flow with their shape and in that way the heat exchange. For this purpose, two heat exchangers of identical size were made: one with annular fins and one with star-shaped fins. Both heat exchangers were experimentally tested with the same equipment and under identical conditions in the Reynolds number range from 20 0 0 to 13, 0 0 0. The test results indicate an increase in the heat flux by 39.3% when applying the star-shaped fins relative to annular fins, with the reduction of the heat exchanger mass by 23.8%.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA