Theoretical and experimental research on interfacial shear stress and interfacial friction factor of gas-liquid two-phase wavy stratified flow in horizontal pipe

2019 ◽  
Vol 55 (8) ◽  
pp. 2117-2135 ◽  
Author(s):  
Yubo Wang ◽  
Liejin Guo
Keyword(s):  
Shear Stress ◽  
Friction Factor ◽  
Experimental Research ◽  
Interfacial Shear Stress ◽  
Stratified Flow ◽  
Interfacial Shear ◽  
Interfacial Friction ◽  
Two Phase ◽  
Horizontal Pipe

Interfacial Shear in Two-Phase Wavy Flow in Closed Horizontal Channels

1974 ◽  
Vol 96 (2) ◽  
pp. 97-102 ◽  
Author(s):  
E. Kordyban
Keyword(s):  
Shear Stress ◽  
Pressure Drop ◽  
Wall Shear Stress ◽  
Cross Section ◽  
Water Surface ◽  
Interfacial Shear Stress ◽  
Interfacial Shear ◽  
Channel Cross Section ◽  
Two Phase ◽  
The Waves

The interfacial shear stress for air flowing over a wavy water surface was determined experimentally in a closed horizontal channel by measuring the pressure drop and the structure of the water surface. The wall shear stress was measured with the aid of a Preston gauge. The range of tests included the conditions where the waves were large in comparison to the channel cross section. The equivalent sand roughness determined from the resistance formula for rough walls in fully turbulent flow was found to be related to the rms wave height through ks = 32Δh.

scholarly journals Uncertainty quantification of RELAP5/MOD3.3 for interfacial shear stress during small break LOCA

2021 ◽  
Vol 7 (3) ◽  
pp. 1-7
Author(s):  
Hanh Tung DUONG ◽  
Hoang Anh NGUYEN ◽  
Richard TREWIN ◽  
Hiroshige KIKURA
Keyword(s):  
Shear Stress ◽  
Nuclear Power ◽  
System Analysis ◽  
Fluid Model ◽  
Interfacial Shear Stress ◽  
Reactor Core ◽  
Computer Code ◽  
Interfacial Shear ◽  
Two Phase ◽  
Two Fluid

The Best-Estimate Plus Uncertainty (BEPU) is applied as Deterministic Approach forsafety analysis of Nuclear Power Plant using the system analysis code. The system analysis code such as Relap5/Mod3.3 is required to be able to simulate the thermal-hydraulic behavior of nuclear reactor in some accident scenarios. Relap5/Mod3.3 is developed based on two-fluid models and 6 conservation equations for each phase which challenge for mathematical modeling such as onedemensional equation, time-dependent equation, multidimensional effects or complicated geometry. Thus, it is necessary to verify the applicability of a system analysis code that is able to predict accurately the two-phase flow such as interfacial shear stress between two phases: liquid and gases. It is also important to know the prediction uncertainty by using computer code due to the constitutive relation in the two-fluid model equation. In PWR’s Small-Break LOCA (SB-LOCA) accident, the loop-seal clearing is important phenomena where we would like to know how much water (reflux condensation) will be come into the reactor core from Steam Generator. In this work, the UPTFTRAM simulated the counter-current flow in Loop-seal Clearing between vapor and liquid in Loopseal during SB-LOCA is used to verify the applicability of Relap5/Mod3.3 and the experimental data are used to compare with simulation results. Moreover, the uncertainty evaluation or estimation is also investigated by applying the statistical method or BEPU in which the SUSA program developed by GRS is used.

Experimental Research and Numerical Analysis of Type Selection of Fiber for High Performance Hydraulic Concrete

2011 ◽  
Vol 83 ◽  
pp. 85-90
Author(s):  
Jun Yong He ◽  
Xiao Qing Huang ◽  
Cheng Yu Tian
Keyword(s):  
Shear Stress ◽  
Experimental Research ◽  
High Performance ◽  
Interfacial Shear Stress ◽  
Basalt Fiber ◽  
Interfacial Shear ◽  
Polyacrylonitrile Fiber ◽  
Type Selection ◽  
Hydraulic Concrete ◽  
Fiber Concrete

Basalt fiber has the advantages of non-pollution and omnipotence, and expected to be widely used in the 21st Century. Therefore, more and more attention is paid on experimental research of the basalt fiber in the world. Firstly, according to the type selection principles and requirements of the fibers used in the hydraulic concrete, the contrast testing of the plastic shrinkage between fiber cement mortar and pure mortar is made. The experimental results showed that basalt fiber, polypropylene fiber and polyacrylonitrile fiber can be preliminarily chosen as reinforced fibers in high performance hydraulic concrete. Secondly, the impacts of the suggested three sorts of fibers on the interfacial shear stress of the fiber concrete are analyzed by numerical simulation，which showed that maximum interfacial shear stress of the basalt fiber concrete is minimum. So, the bond strength between basalt fiber and concrete is the best. Finally, taking both characteristics of basalt fiber and the increase of concrete costs into account, it can be concluded that top priority should be given to the basalt fiber rather than to other fibers for high performance hydraulic concrete.

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