An Experimental Investigation of Swirl Flow in Axial Acoustic Fields

2009 ◽  
Author(s):  
Ramaswamy Kumara Gurubaran ◽  
R I Sujith
Keyword(s):  
Experimental Investigation ◽  
Swirl Flow ◽  
Acoustic Fields

Numerical and Experimental Investigation of In-Cylinder Swirl Flow Using Twisted Tape in Diesel Engines

2013 ◽  
Author(s):  
Srikanth Aravamuthan ◽  
Gopal Singh Rathore ◽  
Rahul Pradhan ◽  
R Thundil Karuppa Raj
Keyword(s):  
Experimental Investigation ◽  
Diesel Engines ◽  
Swirl Flow ◽  
Twisted Tape

A Swirl Cooling Flow Experimental Investigation on a Circular Chamber Using Three-Dimensional Stereo-Particle Imaging Velocimetry

2019 ◽  
Vol 142 (4) ◽  
Author(s):  
Daisy Galeana ◽  
Asfaw Beyene
Keyword(s):  
Experimental Investigation ◽  
Axial Velocity ◽  
Three Dimensional ◽  
Swirl Flow ◽  
Internal Cooling ◽  
Swirl Number ◽  
Cooling Flow ◽  
Downstream Distance ◽  
Flow Phenomena ◽  
Particle Imaging

Abstract An experimental investigation is presented using three-dimensional (3-D) stereo-particle image velocimetry (stereo-PIV) of a swirl flow that models a gas turbine blade internal cooling configuration. The study is intended to provide an evaluation of the developments of the swirl cooling flow methodology utilizing the 3-D stereo-PIV. The objective is to determine the critical swirl number that has the potential to deliver the maximum axial velocity results. The swirl cooling flow methodology comprises cooling air channeling through the blade’s internal passages lowering the temperature; therefore, the experimental circular chamber is made of acrylic allowing detailed measurements and includes seven discrete tangential jets designed to create the swirl flow. An oil particle seeder (LAVision) is used to provide the particles for velocity measurements while the clear acrylic chamber allows visualization of the flow phenomena. The post-processed data are completed using davis, velocity calculations are conducted in matlab, and techplot is used for data visualization. The focus of this investigation is on the continuous swirl flow that must be sustained via continuous injection of tangential flow at three different Reynolds number, 7000, 14,000, and 21,000, where the swirl flow is generated with seven inlets. Important variations in the swirl number are present near the air inlets and decreases with downstream distance as predicted, since the second half of the chamber has no more inlets. The axial velocity reaches the maximum downstream in the second half of the chamber. The circumferential velocity decreases the downstream distance and reaches the highest toward the center of the chamber.

Optimization of Bubble Eliminator Through Numerical and Experimental Investigation

2012 ◽  
Vol 6 (4) ◽  
pp. 418-425 ◽  
Author(s):  
Sayako Sakama ◽  
◽  
Yutaka Tanaka ◽  
Ryushi Suzuki ◽  
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Flow Visualization ◽  
Swirl Flow ◽  
Optimal Shape ◽  
Air Bubbles ◽  
Hydraulic Systems ◽  
Inlet Tube ◽  
Technical Issues ◽  
Selection Of

Air bubbles in working oil affect the stiffness and efficiency of hydraulic systems; thus it is important for technical issues that air bubbles be actively eliminated from the hydraulic oil. A bubble eliminator is a device that uses a swirl flow to remove air bubbles. The shape of the device affects bubble elimination performance, so the selection of shape is the most important parameter in increasing the performance of the device. The purpose of this study is to design a bubble eliminator with an optimal shape. This paper discusses the validity of numerical simulation by comparing, using various diameters of the vent port, the numerical results with the results of the experimental flow visualization. Moreover, we focus on the length of the inlet tube and tapered tube of the bubble eliminator and establish a method of selecting them.

Experimental Investigation to Evaluate the Optimum Performance of Helical Coiled Tube with Insert and Nano-Fluid

2014 ◽  
Vol 1036 ◽  
pp. 89-94
Author(s):  
Saleh Mahdi Qasim ◽  
Sahar A. Fattah ◽  
Osama M. Jassim
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Nusselt Number ◽  
Swirl Flow ◽  
Friction Loss ◽  
Test Fluid ◽  
Dean Number ◽  
Coiled Tube ◽  
Helical Tube ◽  
Wire Coil

In the present work an experimental investigation is carried out to evaluate the performance of helical coiled tube with the swirl flow device using Al2O3nanofluid.The effects of wire coil insert with different parameter on heat transfer and friction loss in the helical tube were examined with Dean number (De) ranging from 700 to 2000. The circular or square coil wire has different cross sections, insertedin the tube with different pitch. The wire coil with Al2O3 nanoparticles with a diameter of 80nm dispersed in distilled water with volume concentrations of (0.08,0.1, 0.2and 0.3 vol.% ) were used as the test fluid. The effects of Dean Number, volume concentration of suspended nanoparticles, and wire coil on heat characteristics were investigated. The results reveal that the use of tabulators leads to a considerable increase in heat transfer and friction loss over those of a smooth tube. The Nusselt number increases with increasing of Dean number and reduction in pitch of wire coil. The square type of wire coil provides slightly higher heat transfer than the circular under the same conditions. Results show that the optimum heat transfer is caused of P=15mm of wire coils. Adding nanoparticles to the base fluid causes a significant enhancement in heat transfer characteristics. The overall enhancement in heat transfer using two mechanisms simultaneously compared to using pure fluid within the smooth helical tube exceeds over 213.2% (180% spring enhancement +33.2%Al2O3). The optimum results were found to be P=15mm, φ=0. 3Al2O3 t=2mm square cross section and De=1889. Finally, empirical correlations are developed of predicting Nusselt number of the flow with and without nanofluid. Comparison between the present result in reference results show good agreement.

Experimental investigation of the atomization behavior of ethanol and kerosene in acoustic fields

Fuel ◽  
2017 ◽  
Vol 202 ◽  
pp. 613-619 ◽  
Author(s):  
Dehao Ju ◽  
Xiaochuan Sun ◽  
Xiaoxu Jia ◽  
Zhong Huang ◽  
Xinqi Qiao ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Acoustic Fields

Experimental Investigation of the Evaporation of Droplets in Axial Acoustic Fields

2000 ◽  
Vol 16 (2) ◽  
pp. 278-285 ◽  
Author(s):  
R. I. Sujith ◽  
G. A. Waldherr ◽  
J. I. Jagoda ◽  
B. T. Zinn
Keyword(s):  
Experimental Investigation ◽  
Acoustic Fields ◽  
Evaporation Of Droplets

scholarly journals Investigation of the free turbulent swirl jet behind the axial fan

2017 ◽  
Vol 21 (suppl. 3) ◽  
pp. 771-782 ◽  
Author(s):  
Novica Jankovic
Keyword(s):  
Experimental Investigation ◽  
Fourth Order ◽  
Isotropic Turbulence ◽  
Laser Doppler Anemometry ◽  
Central Zone ◽  
Swirl Flow ◽  
Axial Fan ◽  
Gaussian Distributions ◽  
Injection Zone ◽  
Flow Anisotropy

Experimental investigation of the free turbulent swirl jet behind the axial fan, by use of the three-component laser Doppler anemometry is presented in this paper. Axial fan generates Rankine swirl. Measurements have been performed in five vertical measuring sections downstream for one rotation number 1500 rpm. Time averaged velocity components and their profile transformation downstream were investigated. Statistical moments of the second, third and fourth order have been calculated and presented. The highest turbulence levels are reached in the central zone, more precisely ? shear layer zone and in the injection zone. Skewness and flatness factors differ from normal Gaussian distributions. Turbulence swirl flow anisotropy is investigated by applying invariant maps. Most of the obtained results are positioned in the region of the three-component isotropic turbulence and axisymmetric expansion.

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