Influence of Stefan flow on the drag coefficient and heat transfer of a spherical particle in a supercritical water cross flow

2021 ◽  
Vol 33 (2) ◽  
pp. 023313
Author(s):  
Hui Jin ◽  
Yingdong Wang ◽  
Huibo Wang ◽  
Zhenqun Wu ◽  
Xiaoyu Li
Keyword(s):  
Heat Transfer ◽  
Drag Coefficient ◽  
Spherical Particle ◽  
Supercritical Water ◽  
Cross Flow ◽  
Stefan Flow

Pressure Loss and Heat Transfer Characterization of a Cam-Shaped Cylinder at Different Orientations

2008 ◽  
Vol 130 (12) ◽  
Author(s):  
A. Nouri-Borujerdi ◽  
Arash M. Lavasani
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Nusselt Number ◽  
Drag Coefficient ◽  
Angle Of Attack ◽  
Cross Flow ◽  
Equivalent Diameter ◽  
Pressure Drag ◽  
The Mean

Pressure drag coefficient and heat transfer are experimentally investigated around a single noncircular cylinder in cross-flow under angle of attack 0 deg<α<360 deg and Reynolds number 1.5×104<Reeq<4.8×104 based on equivalent diameter of a circular cylinder. The results show that the trend of pressure drag coefficient against the angle of attack has a wavy shape but the wavy trend of the Nusselt number is smoother relative to the drag coefficient behavior. It is found that for l∕Deq=0.4 and over the whole range of the Reynolds number, the pressure drag coefficient has a minimum value of about CD=0.4 at α=30 deg, 180 deg, and 330 deg and a maximum value of about CD=0.9 at α=90 deg and 270 deg. The corresponding value of the mean Nusselt number to that of the equivalent circular tube is 1.05<Nu¯cam∕Nu¯cir<1.08 at α=90 deg and 270 deg as well as 0.87<Nu¯cam∕Nu¯cir<0.92 at α=30 deg and 180 deg.

scholarly journals Investigation on drag coefficient of supercirtical water cross-flow past cylinder biomass particel at low Reynolds numbers

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 383-389 ◽  
Author(s):  
Zhen-Qun Wu ◽  
Hui Jin ◽  
Yi-Fei Ren ◽  
Lie-Jin Guo
Keyword(s):  
Reynolds Number ◽  
Drag Coefficient ◽  
Fluidized Bed ◽  
Supercritical Water ◽  
Cross Flow ◽  
Euler Method ◽  
Gas Production ◽  
Viscous Drag ◽  
Force Model ◽  
Two Phase

The supercritical water gasification of biomass technology is a promising approach for the efficient and clean conversion of wet-biomass to hydrogen-rich gas production. Many of the biomass materials are of rodlike shape and gasified in supercritical water fluidized bed. So the particle-fluid two-phase flow behaviors insider supercritical water fluidized bed are of great importance. Constrained by the extreme operating condition, numerical methods, such as the Euler-Euler method and Euler-Lagrange method, are used to study the flow behaviors inside the supercritical water fluidized bed. As the accuracy of these methods are depended on the drag force model and there is little investigation on that at supercritical condition, this work is focused on the drag coefficient of cylinder biomass particle with different ratio of length to diameter. The simulated results show that there is no differ- ence for the drag coefficient of a certain particle at different condition when the Reynolds number is same. The variation tendency of the pressure and viscous drag coefficient with Reynolds number and the ratio of length to diameter is also given in this paper.

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