Optimization and Sensitivity Analysis of a Heat Exchanger Tube Fitted with Cross-cut Twisted Tape with Alternate Axis

[+] Author and Article Information
Mahdi Erfanian Nakhchi

School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran

Javad Abolfazli Esfahani

Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran

1Corresponding author.

ASME doi:10.1115/1.4042780 History: Received October 12, 2018; Revised January 30, 2019


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 , cross-cut width ratio , cross-cut length ratio , and twist ratio . The objective functions are the Nusselt number ratio , the friction factor ratio , and the thermal performance . Response surface method (RSM) is used to construct second-order polynomial functions to study the 3D surfaces and sensitivity of the system to the different geometrical parameters of CCTA. 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 to and is positive at . This indicates that an increment in Reynolds number led to an enhancement in friction factor ratio. Results reveal that thermal performance enhances with increasing the width to diameter ratio of the twisted tape . The maximum thermal performance factor of 1.531 is obtained for the case of , and .

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