![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
ABSTRACT
The current study investigates the distribution of local heat transfer coefficient, measurement of pressure loss and CHF in a lobed horizontal channel for flow boiling. Lobed channels with different lobed depths of 2.3, 2.0 and 1.25 mm, each having three different channel lengths (400, 600, and 1000 mm), are used for the experiments. The working substance used is R-123 with different mass flux. The heat flux range used is from 14 to 375 kW/m2. Pressure drop, critical heat flux, and local heat transfer coefficients of the lobed channel are compared with corresponding smooth horizontal tubes.
Acknowledgments
The authors would like to acknowledge the Ministry of Defence (R & D) India for its funding. Furthermore, the authors are thankful to Mr. G.K. Verma and Mr. Shirsat as they supported the fabrication of the setup and performing experiments. The first author conveys his gratitude to Dharmsinh Desai University, Nadiad 387001 (Gujarat), India, and AICTE for sponsoring him for the research work at IIT Bombay.
Disclosure statement
No potential conflict of interest was reported by the authors.
Contribution of the work
Investigation on the horizontal lobed channel is novel thought in the field of two-phase heat transfer and critical heat flux. In the present work use of thermography measures the temperature at all the local locations of the test channel surfaces; hence it also identifies a hot spot location if it is there. Summary of data on critical heat flux is presented, which can be used as ready reference data on critical heat flux. Fluid-to-fluid modeling can be used to find CHF even for the other fluid for the horizontal lobed channel. Even in the existing units, the plain tube can easily be replaced with a lobed channel without any trouble and much additional cost.