Wettability is known to play a major role in enhancing pool boiling heat transfer.In this context bioinspired surfaces can bring significant advantages in pool boiling applications.This work addresses a numerical inve...Wettability is known to play a major role in enhancing pool boiling heat transfer.In this context bioinspired surfaces can bring significant advantages in pool boiling applications.This work addresses a numerical investigation of bubble growth and detachment on a biphilic surface pattern,namely in a superhydrophobic region surrounded by a hydrophilic region.Surface characteristics resemble bioinspired solutions explored in our research group,mainly considering the main topographical characteristics.This numerical approach is intended to provide additional information to an experimental approach,allowing to obtain temperature,pressure and velocity fields in and around the bubble,which help to describe bubble dynamics.The model was validated based on experimental data obtained with extensive image processing of synchronized high-speed video and high-speed thermographic images.The results obtained here clearly evidence that combining enhanced direct numerical simulations with high-resolution transient experimental measurements is a promising tool to describe the complex and intricate hydrodynamic and heat transfer phenomena governing pool boiling on heated biphilic surfaces.展开更多
基金Authors from the IN+team would like to acknowledge Fundacao para a Ciencia e Tecnologia for partially supporting the research ulider the fralewurk uf the proect JICAM/0003/2017 and of project UTAP-EXPL/CTE/0064/2017Dr.Anastasios Georgoulas would like to acknowledge the financial support from the Engineering and Physical Science Research Council in UK,through the grant EP/P013112/1 as well as the ESA MAP Projects TOPDESS and ENCOM4.
文摘Wettability is known to play a major role in enhancing pool boiling heat transfer.In this context bioinspired surfaces can bring significant advantages in pool boiling applications.This work addresses a numerical investigation of bubble growth and detachment on a biphilic surface pattern,namely in a superhydrophobic region surrounded by a hydrophilic region.Surface characteristics resemble bioinspired solutions explored in our research group,mainly considering the main topographical characteristics.This numerical approach is intended to provide additional information to an experimental approach,allowing to obtain temperature,pressure and velocity fields in and around the bubble,which help to describe bubble dynamics.The model was validated based on experimental data obtained with extensive image processing of synchronized high-speed video and high-speed thermographic images.The results obtained here clearly evidence that combining enhanced direct numerical simulations with high-resolution transient experimental measurements is a promising tool to describe the complex and intricate hydrodynamic and heat transfer phenomena governing pool boiling on heated biphilic surfaces.
