Journal
ADVANCED MATERIALS INTERFACES
Volume 9, Issue 34, Pages -Publisher
WILEY
DOI: 10.1002/admi.202201224
Keywords
heat-transfer enhancement; non-Newtonian fluids; slippage; superhydrophobic surfaces; thermal resistance
Funding
- National Natural Science Foundation of China [22178160, 21838004, 21808102]
- Swedish Energy Agency [45957-1]
- Swedish Research Council for Environment, Agricultural Sciences, and Spatial Planning [Formas] [2019-01162]
- State Key Laboratory of Materials-Oriented Chemical Engineering [ZK202005]
- Youth Foundation of Jiangsu Province [BK20220349]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX21_0503]
- Excellent postdoctoral program of Jiangsu Province
- Jiangsu SpeciallyAppointed Professor Plan
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A new strategy for high-efficient heat transfer in non-Newtonian fluids using a superhydrophobic coating is presented in this study. The slip behavior and heat transfer processes of a typical non-Newtonian fluid on the coating are investigated, and a novel porous spherical superhydrophobic coating is obtained. The results show that the shear stress in electrodeposition is a key parameter to control the morphology and wetting ability of the coating. A new parameter, Re/l(s)*, is proposed for guiding heat transfer enhancement with slippage.
In this study, a new strategy to achieve high-efficient heat transfer for non-Newtonian fluids with slippage using a stably prepared superhydrophobic coating is presented. A superhydrophobic coating is prepared on the inner surface of a sleeve at specific shear stress. The slippage and heat-transfer processes of the typical non-Newtonian fluid-1% carboxymethyl cellulose solutions on the superhydrophobic coating are investigated simultaneously. A novel porous spherical type of superhydrophobic coating with a contact angle of 168 degrees is obtained. It is found that the shear stress in electrodeposition is a key parameter to control the morphology and wetting ability of the superhydrophobic coating. The slip length and enhancement factor of heat transfer for the non-Newtonian fluid on the coating are found in a range of 20-900 mu m and 1.47 experimentally. A new parameter is proposed as Reynolds number Re divided by the dimensionless slip length l(s)* (Re/l(s)*) for the heat-transfer enhancement with slippage, which can be used as the guide for designing coating and selecting the operating conditions. The Re/l(s)* is <4, which can enhance the heat transfer via the slippage.
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