scholarly journals Heat transfer properties of Morpho butterfly wings and the dependence of these properties on the wing surface structure

RSC Advances ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 2786-2790
Author(s):  
Mari Kawabe ◽  
Hirotaka Maeda ◽  
Toshihiro Kasuga
Keyword(s):  
Heat Transfer ◽  
Surface Structure ◽  
Wing Surface ◽  
Butterfly Wings ◽  
Blue Line ◽  
Transfer Properties ◽  
Morpho Butterfly ◽  
Red Line

The heat transfer properties of Morpho butterfly wings (red line) were higher than those of Cithaerias wings (blue line) due to their surface structure and emissivity.

Effect of Microstructures on Superhydrophobic and Slippery Lubricant-Infused Porous Surfaces During Condensation Phase-Change

2018 ◽  
Author(s):  
Daniel Orejon ◽  
Yota Maeda ◽  
Fengyong Lv ◽  
Peng Zhang ◽  
Yasuyuki Takata
Keyword(s):  
Heat Transfer ◽  
Surface Structure ◽  
Heat Transfer Performance ◽  
Contact Angle Hysteresis ◽  
Jumping Performance ◽  
Porous Surfaces ◽  
Transfer Properties ◽  
Surface Energy Analysis ◽  
Effect Of Surface ◽  
Oxidation Growth

Superhydrophobic surfaces (SHSs) and slippery lubricant-infused porous surfaces (SLIPSs) are receiving increasing attention for their excellent anti-icing, anti-fogging, self-cleaning and condensation heat transfer properties. The ability of such surfaces to passively shed and repel water is mainly due to the low-adhesion between the liquid and the solid surface, i.e., low contact angle hysteresis, when compared to hydrophilic or to hydrophobic surfaces. In this work we investigated the effect of surface structure on the condensation performance on SHSs and SLIPSs. Three different SHSs with structures varying from the micro- to the nano-scale were fabricated following easy and scalable etching and oxidation growth procedures. The condensation performance on such surfaces was evaluated by optical microscopy in a temperature and humidity controlled environmental chamber. On SHSs important differences on the size and on the number of the coalescing droplets required for the jump to ensue were found when varying the surface structure underneath the condensing droplets. A surface energy analysis is proposed to account for the suppression of the droplet-jumping performance in the presence of microstructures. On other hand, by impregnating the same SHSs with a low surface tension oil, i.e., SLIPSs, the adhesion between the condensate and the SLIPSs can be further reduced. On SLIPSs slight differences on the droplet density over time and shedding performance upon the inclusion of microstructures were observed. Droplets were found to shed faster and with smaller diameters on SLIPSs in the presence of microstructures when compared to solely nanostructured SLIPSs. We conclude that on SHSs the droplet-jumping performance of micrometer droplets is deteriorated in the presence of microstructures with the consequent decrease in the heat transfer performance, whereas on SLIPSs the droplet self-removal is actually improved in the presence of microstructures.

Boiling Heat Transfer Properties of Copper Surface with Different Microstructures

2021 ◽  
pp. 124589
Author(s):  
Liying Wang ◽  
Yonghua Wang ◽  
Wen Cheng ◽  
Huadong Yu ◽  
Jinkai Xu
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Copper Surface ◽  
Transfer Properties

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

2021 ◽  
Vol 125 (14) ◽  
pp. 7808-7823
Author(s):  
Mikhail A. Proskurnin ◽  
Liliya O. Usoltseva ◽  
Dmitry S. Volkov ◽  
Dmitry A. Nedosekin ◽  
Mikhail V. Korobov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Detonation Nanodiamonds ◽  
Photothermal Microscopy ◽  
Transient Spectroscopy ◽  
Transfer Properties

Numerical Simulation of Temperature Field on Different Surface Structure of Bicycle Brake Pairs

2014 ◽  
Vol 697 ◽  
pp. 235-238
Author(s):  
Gang Wu ◽  
Can Chao Huang ◽  
Hong Ling Qin ◽  
Chun Hua Zhao
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Surface Structure ◽  
Surface Structures ◽  
Temperature Fields ◽  
Transfer Model ◽  
Pair Model ◽  
Layer Composite ◽  
Positive Effect ◽  
Heat Loads

Using the basic principle of heat transfer, tribology and numerical simulation, a two-dimensional heat transfer model of the three-layer composite brake pair materials were established. The temperature fields of brake pairs during the process of friction were analyzed. Applied given heat loads at different time node on the brake pair model, the temperatures of different bicycle brake pairs were compared and analyzed. Results show that the improved surface structures of brake pair have positive effect on decreasing the temperature of contact areas than that of ordinary surface structure.

A Control-Oriented Polytropic Model of SI Engine Intake Manifold

2003 ◽  
Author(s):  
Josˇko Deur ◽  
Davor Hrovat ◽  
Josˇko Petric´ ◽  
Zˇeljko Sˇitum
Keyword(s):  
Heat Transfer ◽  
Intake Manifold ◽  
Simple Extension ◽  
Si Engine ◽  
Polytropic Model ◽  
Back Flow ◽  
Thermal Transients ◽  
Three State Model ◽  
Transfer Properties ◽  
Variant Structure

The paper presents experimental results which show significant changes of the intake manifold air temperature during fast tip-in/tip-out engine transients. An adequate two-state polytropic manifold model is developed and experimentally validated. An emphasis is on the derivation and parameterization of a time-variant structure of the heat transfer coefficient. The polytropic manifold model is extended to a three-state form for the more general case of different heat transfer properties for the manifold plenum and runners. An influence of the engine back flow on the runner thermal transients is observed. A simple extension of the three-state model with the back flow effect is proposed.

Structuring zeolite bodies for enhanced heat-transfer properties

2015 ◽  
Vol 208 ◽  
pp. 196-202 ◽  
Author(s):  
Lars Borchardt ◽  
Nina-Luisa Michels ◽  
Torsten Nowak ◽  
Sharon Mitchell ◽  
Javier Pérez-Ramírez
Keyword(s):  
Heat Transfer ◽  
Enhanced Heat Transfer ◽  
Transfer Properties
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