Imperial College London
Portrait Picture

Professor Omar K. Matar, FREng

Faculty of Engineering, Department of Chemical Engineering

Head of Department of Chemical Engineering
 
 
 
//

Contact

 

+44 (0)20 7594 9618o.matar Website

 
 
//

Assistant

 

Mr Avery Kitchens +44 (0)20 7594 6263

 
//

Location

 

305 ACEACE ExtensionSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{PAUL:2021:10.1299/jtst.2021jtst0007,
author = {PAUL, S and HSU, W-L and MAGNINI, M and MASON, LR and ITO, Y and HO, Y-L and MATAR, OK and DAIGUJI, H},
doi = {10.1299/jtst.2021jtst0007},
journal = {Journal of Thermal Science and Technology},
pages = {1--20},
title = {Analysis and control of vapor bubble growth inside solid-state nanopores},
url = {http://dx.doi.org/10.1299/jtst.2021jtst0007},
volume = {16},
year = {2021}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The increasing demands of computational power have accelerated the development of 3D circuits in the semiconductor industry. To resolve the accompanying thermal issues, two-phase microchannel heat exchangers using have emerged as one of the promising solutions for cooling purposes. However, the direct boiling in microchannels and rapid bubble growth give rise to highly unstable heat flux on the channel walls. In this regard, it is hence desired to control the supply of vapor bubbles for the elimination of the instability. In this research, we investigate a controllable bubble generation technique, which is capable of periodically producing bubble seeds at the sub-micron scale. These nanobubbles were generated in a solid-state nanopore filled with a highly concentrated electrolyte solution. As an external electric field was applied, the localized Joule heating inside the nanopore initiated the homogeneous bubble nucleation. The bubble dynamics was analyzed by measuring the ionic current variation through the nanopore during the bubble nucleation and growth. Meanwhile, we theoretically examined the bubble growth and collapse inside the nanopore by a moving boundary model. In both approaches, we demonstrated that by altering the pore size, the available sensible heat for the bubble growth can be manipulated, thereby offering the controllability of the bubble size. This unique characteristic renders nanopores suitable as a nanobubble emitter for microchannel heat exchangers, paving the way for the next generation microelectronic cooling applications.
AU  - PAUL,S
AU  - HSU,W-L
AU  - MAGNINI,M
AU  - MASON,LR
AU  - ITO,Y
AU  - HO,Y-L
AU  - MATAR,OK
AU  - DAIGUJI,H
DO  - 10.1299/jtst.2021jtst0007
EP  - 20
PY  - 2021///
SN  - 1880-5566
SP  - 1
TI  - Analysis and control of vapor bubble growth inside solid-state nanopores
T2  - Journal of Thermal Science and Technology
UR  - http://dx.doi.org/10.1299/jtst.2021jtst0007
UR  - https://www.jstage.jst.go.jp/article/jtst/16/1/16_2021jtst0007/_article
UR  - http://hdl.handle.net/10044/1/94522
VL  - 16
ER  -
Download