Comprehensive Investigation of Diffuser/Nozzle Element at Low Reynolds Number Aimed at Valveless Pump Design

2015 ◽  
Vol 07 (04) ◽  
pp. 1550058 ◽  
Author(s):  
Jiaqi Wang ◽  
K. C. Aw ◽  
Andrew McDaid ◽  
Rajnish N. Sharma
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Selection Criterion ◽  
Operational Parameters ◽  
Pump Design ◽  
Half Angle ◽  
Valveless Pump ◽  
Flow Through ◽  
Valveless Pumps ◽  
Low Reynolds

The performance of diffuser/nozzle element in valveless pumps depends upon a number of geometrical and operational parameters. In this study, the characteristics of low Reynolds number (Re < 100) flow through conical and planar diffuser/nozzle elements with varying half-angle and area ratio (AR) were investigated with simulations and experiments. The optimal half-angle, at which maximum diffuser efficiency occurs, was found to decrease with Reynolds number for both conical and planar elements. Therefore, the results provide a selection criterion for a diffuser/nozzle pair in a valveless micropump design, where no such criterion is available so far.

EFFECT OF ASPECT RATIO ON PRESSURE LOSS AND CHARACTERISTICS OF LOW REYNOLDS NUMBER FLOW THROUGH NARROW SLOTS

2017 ◽  
Author(s):  
Yishak Abdulhafiz Yusuf ◽  
Aleksey Baldygin ◽  
Reza Sabbagh ◽  
Michael Leitch ◽  
Prashant R. Waghmare ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Aspect Ratio ◽  
Pressure Loss ◽  
Low Reynolds Number ◽  
Low Reynolds Number Flow ◽  
Reynolds Number Flow ◽  
Number Flow ◽  
Flow Through ◽  
Low Reynolds

Short-time asymptotics of hydrodynamic dispersion in porous media

2013 ◽  
Vol 732 ◽  
pp. 687-705 ◽  
Author(s):  
Tyler R. Brosten
Keyword(s):  
Reynolds Number ◽  
Porous Media ◽  
Low Reynolds Number ◽  
Low Reynolds Number Flow ◽  
Reynolds Number Flow ◽  
Number Flow ◽  
Flow Through ◽  
Time Expansion ◽  
Low Reynolds ◽  
Short Time

AbstractWe consider convection–diffusion transport of a passive scalar within porous media having a piecewise-smooth and reflecting pore–grain interface. The corresponding short-time expansion of molecular displacement time-correlation functions is determined for the generalized steady convection field. By interpreting the generalized short-time expansion of dispersion dynamics in the context of low-Reynolds-number flow through macroscopically homogeneous porous media, we demonstrate the connection between hydrodynamic permeability and short-time dynamics. The analytical short-time expansion is compared with numerical simulation data for steady low-Reynolds-number flow through a random close-pack array of mono-disperse spheres. The quadratic short-time expansion term of the dispersion coefficient closely predicts the numerical data for a mean displacement of at least 10 % of the sphere diameter for a Péclet number of 54.49.

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