Journal
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
Volume 141, Issue 4, Pages -Publisher
ASME
DOI: 10.1115/1.4042780
Keywords
cross-cut twisted tape; thermal performance; heat transfer enhancement; response surface method; sensitivity analysis
Categories
Ask authors/readers for more resources
Numerical simulations are used to analyze the thermal performance of turbulent flow inside heat exchanger tube fitted with cross-cut twisted tape with alternate axis (CCTA). The design parameters include the Reynolds number (5000 < Re < 15; 000), cross- cut width ratio (0.7 < b/D < 0.9), cross- cut length ratio (2 < s/D < 2.5), and twist ratio (2 < y/D < 4). The objective functions are the Nusselt number ratio (Nu/Nus), the friction factor ratio of (f/f(s)), and the thermal performance (eta). Response surface method (RSM) is used to construct second- order polynomial correlations as functions of design parameters. The regression analysis shows that heat transfer ratio decreased with increasing both the Reynolds number and the width to diameter ratio of the twisted tape. This means that the twisted tape has more influence on heat transfer at smaller inlet fluid velocities. Sensitivity analysis reveals that among the effective input parameters, the sensitivity of (Nu/Nus) to the Reynolds number is the highest. The results reveal that thermal performance enhances with increasing the width to diameter ratio of the twisted tape (b/D). The maximum thermal performance factor of 1.531 is obtained for the case of Re = 5000, b/D = 0.9, s/D = 2.5, and y/D = 4.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available