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Diffuser (thermodynamics)

About: Diffuser (thermodynamics) is a research topic. Over the lifetime, 6731 publications have been published within this topic receiving 54738 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a glass Venturi with a long throat (three throat diameters) is inserted into a pneumatic conveying test rig, which has similar pipe configuration, and powder and air dynamic similarity to a coal fired power station.

16 citations

Journal ArticleDOI
TL;DR: In this article, the design of air-to-air, thrust augmenting ejector having short curved wall diffuses utilizing boundary layer control was discussed, and a new high level of performance was analytically predicted and achieved experimentally.
Abstract: The design of air-to-air, thrust augmenting ejectors having short curved wall diffuses utilizing boundary layer control is discussed. The design is achieved by an inverse method which uses the vorticity at the diffuser inlet as a flow parameter in the analysis. Three diffusers having ejector length-to-mixing chamber diameter ratios of approximately 6:1 and mixing chamber inlet area-to-primary nozzle area ratios of 20:1 and 40:1 were designed and tested. A new high level of performance was analytically predicted and achieved experimentally. Comparisons between predicted and observed performances, velocity distributions and pressure distributions are presented.

16 citations

Journal ArticleDOI
TL;DR: Experimental and simulation results demonstrated that the structure natural frequencies of the actuator-membrane structure do not play any role in micropump operations, suggesting that the flow rate spectrum has a parabolic shape.
Abstract: This study develops a diffuser micropump and characterizes its output flow rates, such as the parabola shape on the frequency domain and the affecting factors. First, an equivalent circuit using electronic–hydraulic analogies was constructed. Flow rate analysis results were then compared to experimental results to verify the applicability of the circuit simulation. The operational frequency was 800 Hz for both cases and maximum flow rates were 0.078 and 0.075 μl/s for simulation and experimental results, respectively. Maximum flow rate difference between simulation and experiment was 3.7%. The circuit was then utilized to analyze inertial effects of transferred fluid and system components on output flow rates. This work also explained why the flow rate spectrum has a parabolic shape. Analysis results demonstrated that without inertial effects, micropump flow rates are linearly proportional to operational frequency; otherwise flow rate spectrum has parabolic shape. The natural frequency of the actuator-membrane structure was identified using the finite element method to verify whether this parameter affects flow rate characteristics. Experimental and simulation results demonstrated that the frequency of the maximum pumping flow rate was 800 Hz and the first mode natural frequency of actuator-membrane structure was 91.4 kHz, suggesting that the structure natural frequencies of the actuator-membrane structure do not play any role in micropump operations.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors used a thermodynamic code accounting for real gas behavior to give a first design of the mixing chamber and diffuser according to the CRMC criterion and also gave an estimation of the friction loss along the diffuser.

16 citations

Patent
13 Sep 1973
TL;DR: A rotary pump having a plurality of impeller blades and circumferentially spaced vanes located about the periphery of said blades is described in this paper, where the spacing between adjacent vanes is nonuniform to prohibit uniform pressure patterns in the process fluid.
Abstract: A rotary pump having a plurality of impeller blades and a plurality of circumferentially spaced vanes located about the periphery of said blades. The blades and vanes cause the fluid being acted upon by the pump to be delivered in pressure pulses of relatively high frequency and low magnitude. The spacing between adjacent vanes is nonuniform to prohibit uniform pressure patterns in the process fluid.

16 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
2021156
2020186
2019216
2018236
2017263