Boiling heat transfer enhancement over copper tube via electrolytic and electrostatic effects
Journal
Applied Thermal Engineering
Journal Volume
199
Date Issued
2021
Author(s)
Abstract
The effects of electrolytic pool boiling with and without the application of charged surfactants on heat transfer performance were experimentally investigated. The experiments were conducted at the saturated state under atmospheric pressure. This is the first study of the heat transfer mechanism in pool boiling using electrolysis with charged surfactants on copper tubes. The results indicate that heat transfer performance is not proportional to the applied electrolytic current. An optimal current was obtained for the enhancement of the heat transfer coefficient during electrolytic boiling. Supported by high-speed images, an analysis of bubble behaviors under different conditions was conducted. Compared with when water was used as the working fluid without the application of an electric field, the use of charged surfactants in electrolytic boiling with a current of 3 mA resulted in a 1.68 times higher heat transfer coefficient due to the number of bubble nucleation sites and the bubble departure frequency. Furthermore, the circumferential surface temperature distributions during boiling under different experimental conditions were elucidated by the analysis of bubble dynamics. ? 2021 Elsevier Ltd
Subjects
Bubble dynamics
Bubble nucleation
Charged surfactants
Copper tubes
Heat transfer coefficient
Pool boiling
Atmospheric pressure
Copper
Crystallization
Electric fields
Heat transfer coefficients
Nucleation
Surface active agents
Tubes (components)
Boiling heat transfer enhancement
Electrolytics
Electrostatic effect
Heat transfer co-efficients
Heat transfer performance
Bubbles (in fluids)
Type
journal article