Stability of two-layer flows past slippery surfaces. II. Inclined channels

2021 ◽  
Vol 33 (8) ◽  
pp. 084113
Author(s):  
Himanshu Mishra ◽  
Anubhab Roy ◽  
S. Vengadesan
Keyword(s):  
Inclined Channels

scholarly journals Design of Thermal Insulation Materials with Different Geometries of Channels

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2217
Author(s):  
Daniela Șova ◽  
Mariana Domnica Stanciu ◽  
Sergiu Valeriu Georgescu
Keyword(s):  
Thermal Conductivity ◽  
Porous Structure ◽  
Base Material ◽  
Cost Effective ◽  
Heat Radiation ◽  
Average Temperature ◽  
Temperature Regimes ◽  
The Face ◽  
Inclined Channels ◽  
Air Channels

Investigating the large number of various materials now available, some materials scientists promoted a method of combining existing materials with geometric features. By studying natural materials, the performance of simple constituent materials is improved by manipulating their internal geometry; as such, any base material can be used by performing millimeter-scale air channels. The porous structure obtained utilizes the low thermal conductivity of the gas in the pores. At the same time, heat radiation and gas convection is hindered by the solid structure. The solution that was proposed in this research for obtaining a material with porous structure consisted in perforating extruded polystyrene (XPS) panels, as base material. Perforation was performed horizontally and at an angle of 45 degrees related to the face panel. The method is simple and cost-effective. Perforated and simple XPS panels were subjected to three different temperature regimes in order to measure the thermal conductivity. There was an increase in thermal conductivity with the increase in average temperature in all studied cases. The presence of air channels reduced the thermal conductivity of the perforated panels. The reduction was more significant at the panels with inclined channels. The differences between the thermal conductivity of simple XPS and perforated XPS panels are small, but the latter can be improved by increasing the number of channels and the air channels’ diameter. Additionally, the higher the thermal conductivity of the base material, the more significant is the presence of the channels, reducing the effective thermal conductivity. A base material with low emissivity may also reduce the thermal conductivity.

Application of reflux classifier with closely spaced inclined channels in pre-concentrate process of fine antimony oxide particles

2020 ◽  
Vol 27 (11) ◽  
pp. 3290-3301
Author(s):  
Zhen-qiang Liu ◽  
Dong-fang Lu ◽  
Yu-hua Wang ◽  
Hao-ran Chu ◽  
Xia-yu Zheng ◽  
...  
Keyword(s):  
Antimony Oxide ◽  
Oxide Particles ◽  
Inclined Channels

Prediction of particles separation in narrow inclined channels of liquid–solid fluidized bed

2020 ◽  
Vol 360 ◽  
pp. 562-568
Author(s):  
Shengrong He ◽  
Yanfeng Li ◽  
Taishan Liu ◽  
Zhengyong Li ◽  
Peng Chen ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Inclined Channels

Stability of two-layer stratified flow in inclined channels: applications to air entrainment in coating systems

1996 ◽  
Vol 312 ◽  
pp. 173-200 ◽  
Author(s):  
Yuan C. Severtson ◽  
Cyrus K. Aidun
Keyword(s):  
Spectral Decomposition ◽  
Air Entrainment ◽  
Density Variation ◽  
Generalized Eigenvalue ◽  
Long Wave ◽  
Inclined Channels ◽  
The Stability ◽  
Air Liquid Interface ◽  
Sommerfeld Equation ◽  
Interfacial Mode

To understand the physics of air entrainment in thin-film liquid coating and other applications, the stability characteristics of general stratified two-layer Poiseuille-Couette flow are examined in inclined channels. Only one mode of instability, the interfacial mode, is obtained in the long-wave asymptotic limit. The generalized eigenvalue problem, formed by spectral decomposition and solution of the general two-layer Orr-Sommerfeld equation, is solved to obtain all of the critical modes. Analysis of the air/liquid interface corresponding to experiments reveals that because of the large density variation between the two layers, the interfacial mode is the only mode of instability in air entrainment. Results from the stability analysis of the flow near the contact line where air entrainment occurs are consistent with previous experimental observations.

Countercurrent Two-Phase Flow Regimes and Void Fraction in Vertical and Inclined Channels

1995 ◽  
Vol 119 (3) ◽  
pp. 182-194 ◽  
Author(s):  
S. M. Ghiaasiaan ◽  
K. E. Taylor ◽  
B. K. Kamboj ◽  
S. I. Abdel-Khalik
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Flow Regimes ◽  
Phase Flow ◽  
Two Phase ◽  
Inclined Channels

Countercurrent flow limitation in inclined channels with bends

1994 ◽  
Vol 152 (1-3) ◽  
pp. 379-388 ◽  
Author(s):  
S.M. Ghiaasiaan ◽  
R.E. Turk ◽  
S.I. Abdel-Khalik
Keyword(s):  
Countercurrent Flow ◽  
Flow Limitation ◽  
Inclined Channels

Stability of the flow during sedimentation in inclined channels

1983 ◽  
Vol 26 (8) ◽  
pp. 2043 ◽  
Author(s):  
Eric Herbolzheimer
Keyword(s):  
Inclined Channels
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