TY - JOUR
T1 - Investigation of free and forced vortex induced thermal energy exchange potential
AU - Riaz, Muhammad Talha
AU - Cheema, Taqi Ahmad
AU - Tayyab, Muhammad
AU - Khan, Ali Ul Atas
AU - Amber, Khuram Pervez
AU - Sajid, Muhammad Bilal
AU - Park, Cheol Woo
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/8
Y1 - 2022/8
N2 - Recently, the gravitational water vortex flow capability to exchange heat to another fluid that circulates on the outer surface of the basin has been explored by constructing spiral flow channels (SFC). Because of the roller coaster effect, the time and area of contact between the two separate fluid streams for the sole purpose of thermal exchange limited the heat transfer. The present study proposes a new configuration that circulates the hot water in a shell with baffles (SWB) configuration around the basin. Moreover, the effect of a mixer driven by a gravitational water vortex has also been investigated to further enhance the heat transfer without the application of any external power. In short, the present study investigates and compare the heat exchange characteristics of an artificially induced free and forced vortex heat exchanger of both configurations. Each configuration has been tested by varying the hot side mass flow rates as 0.15, 0.25, 0.39, 0.7, 1.23 and 2.4 kg/s. For each mass flow rate maintained on the colder side, i.e., 0.6, 0.7, 0.8, 0.9, 1 and 1.1 kg/s, to determine the outlet temperatures of both sides. Results show that the SWB configuration for the same operating conditions is 1.32 times more effective in exchanging heat than SFC configuration. The presence of a mixer on the colder side decreases the heat transfer rate with a recorded maximum temperature drop of 2.5 K of the cold fluid. Moreover, the heat flux exchanged in the absence of a mixer for SWB and SFC configurations is 2.1 times and 1.32 times greater than those in the presence of the mixer, respectively. Therefore, the presence of the mixer on the colder side is not suitable for heat transfer enhancement in gravitational water vortex flow.
AB - Recently, the gravitational water vortex flow capability to exchange heat to another fluid that circulates on the outer surface of the basin has been explored by constructing spiral flow channels (SFC). Because of the roller coaster effect, the time and area of contact between the two separate fluid streams for the sole purpose of thermal exchange limited the heat transfer. The present study proposes a new configuration that circulates the hot water in a shell with baffles (SWB) configuration around the basin. Moreover, the effect of a mixer driven by a gravitational water vortex has also been investigated to further enhance the heat transfer without the application of any external power. In short, the present study investigates and compare the heat exchange characteristics of an artificially induced free and forced vortex heat exchanger of both configurations. Each configuration has been tested by varying the hot side mass flow rates as 0.15, 0.25, 0.39, 0.7, 1.23 and 2.4 kg/s. For each mass flow rate maintained on the colder side, i.e., 0.6, 0.7, 0.8, 0.9, 1 and 1.1 kg/s, to determine the outlet temperatures of both sides. Results show that the SWB configuration for the same operating conditions is 1.32 times more effective in exchanging heat than SFC configuration. The presence of a mixer on the colder side decreases the heat transfer rate with a recorded maximum temperature drop of 2.5 K of the cold fluid. Moreover, the heat flux exchanged in the absence of a mixer for SWB and SFC configurations is 2.1 times and 1.32 times greater than those in the presence of the mixer, respectively. Therefore, the presence of the mixer on the colder side is not suitable for heat transfer enhancement in gravitational water vortex flow.
KW - Energy balance
KW - Forced vortex
KW - Gravitational water vortex heat exchanger
KW - Mixer
KW - Shell with baffles
KW - Spiral flow channel
UR - http://www.scopus.com/inward/record.url?scp=85125523713&partnerID=8YFLogxK
U2 - 10.1016/j.seta.2022.102107
DO - 10.1016/j.seta.2022.102107
M3 - Article
AN - SCOPUS:85125523713
SN - 2213-1388
VL - 52
JO - Sustainable Energy Technologies and Assessments
JF - Sustainable Energy Technologies and Assessments
M1 - 102107
ER -