Complex effect of recess depth in nozzle design on the discharge coefficient

We used contemporary computational fluid dynamics techniques to evaluate how the geometric parameters of a recessed nozzle affect the perfection of flow processes. We verified our numerical simulation and obtained acceptable agreement between numerical and experimental investigation results in terms of specific impulse loss. We plotted the discharge coefficient as a function of the geometrical parameters of a recessed nozzle. Our numerical investigation forms the basis of certain guidelines we developed for designing arc-based recessed nozzles.

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Self-Noise Analysis of Four-Electrode Microflow-Electrochemical Accelerometer Inspired by Hemodynamic Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.461.984 ◽

2013 ◽

Vol 461 ◽

pp. 984-992 ◽

Cited By ~ 1

Author(s):

Qiu Zhan Zhou ◽

Da Yi Li ◽

Yu Jiang Wang

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Noise Analysis ◽

Three Dimensional ◽

Element Model ◽

The Self ◽

Geometrical Parameters ◽

Dynamics Model ◽

Hemodynamic Model ◽

Three Dimensional Finite Element

A fluid dynamics model of electrolyte in mircroflow inspired by hemodynamic model of aortic is proposed and applied in the self-noise analysis of four-electrode microflow-electrochemical accelerometer. Three-dimensional finite element model is established and invested through numerical simulation, the variety of geometrical parameters on different location of electrode and varied time are considered, which can affect the microflow-electrochemical accelerometers self-noise. The result of numerical simulation indicates that, self-noise is related to electrode configuration as well as electrode geometrical parameters. In particular, convection-induced self-noise is correlated to variety of viscosity, and thermohydrodynamic self-noise is correlated to variety of diameter. Such a fluid dynamics model of electrolyte inspired by thermodynamics model can be also used for optimization of the self-noise.

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Numerical and Experimental Investigation on Forced-Air Cooling of Commercial Packaged Strawberries

International Journal of Food Engineering ◽

10.1515/ijfe-2018-0384 ◽

2019 ◽

Vol 15 (7) ◽

Cited By ~ 3

Author(s):

Da Wang ◽

Yanhua Lai ◽

Hongxia Zhao ◽

Binguang Jia ◽

Qiang Wang ◽

...

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Experimental Investigation ◽

Simulation Model ◽

Cooling Time ◽

Air Cooling ◽

Cooling Process ◽

Uniformity Coefficient ◽

Forced Air ◽

Dynamics Method

AbstractThe numerical simulation model of forced-air cooling of strawberries in a clamshell and a box was established by using computational fluid dynamics method. The cooling process of the simulation and the experiment results agreed well in different conditions, indicating that the simulation model was validated. The results showed that the 7/8 cooling time was 180 min, 135 min, 108 min and 100 min and the cooling uniformity coefficients were 0.31, 0.22, 0.24, 0.26 when the diameters of B-vent(the vent on the box) were 30 mm, 40 mm, 50 mm, 60 mm, respectively. The 7/8 cooling time decreased and the cooling uniformity coefficient improved, when the shape of C-vent (the vent on the clamshell) changed from round to rectangular. The 7/8 cooling time also deceased and the cooling uniformity coefficient increased, when the area of C-vent with both round and rectangular shapes increased. These results indicate that both B-vent and C-vent had significant effect on reducing the cooling time and the improving cooling uniformity for strawberries, It is suggested that the optimized vent ratio of B-vent (the diameter is 40 mm) and C-vent (15 mm round or 20 mm × 15 mm rectangular) for the current commercial packaged strawberries were 9.4 % and 8.5 %, respectively.

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