Experimental evaluation of pressure drop for flows of air and heliox through upper and central conducting airway replicas of 4- to 8-year-old children

2019 ◽  
Vol 82 ◽  
pp. 134-141 ◽  
Author(s):  
Tyler Paxman ◽  
Michelle Noga ◽  
Warren H. Finlay ◽  
Andrew R. Martin
Keyword(s):  
Pressure Drop ◽  
Experimental Evaluation ◽  
Conducting Airway

Experimental Evaluation of Pressure Drop Elements and Fabricated Nucleation Sites for Stabilizing Flow Boiling in Minichannels and Microchannels

2005 ◽  
Author(s):  
Satish G. Kandlikar ◽  
Daniel A. Willistein ◽  
John Borrelli
Keyword(s):  
Pressure Drop ◽  
Experimental Evaluation ◽  
Flow Boiling ◽  
Superheated Liquid ◽  
Working Fluid ◽  
Vapor Bubbles ◽  
Liquid Environment ◽  
Nucleation Sites ◽  
Boiling Process ◽  
Flow Configurations

The flow boiling process suffers from severe instabilities induced due to nucleation of vapor bubbles in a minichannel or a microchannel in a superheated liquid environment. In an effort to improve the flow boiling stability, several modifications are introduced and experiments are performed on 1054 × 197 μm microchannels with water as the working fluid. The cavity sizes and local liquid and wall conditions required at the onset of nucleation are analyzed. The effects of an inlet pressure restrictor and fabricated nucleation sites are evaluated as a means of stabilizing the flow boiling process and avoiding the backflow phenomena. The results are compared with the unrestricted flow configurations in smooth channels.

The Experimental Evaluation of the Performance of Multiphase Flow Meter: Effect of the Distance Between Two Meters

2009 ◽  
Author(s):  
Sang Hyun Park ◽  
Gerald L. Morrison
Keyword(s):  
Reynolds Number ◽  
Pressure Drop ◽  
Experimental Evaluation ◽  
Flow Coefficient ◽  
Base Line ◽  
Flow Conditions ◽  
Flow Meter ◽  
Flow Meters ◽  
Water Cut ◽  
Upstream Flow

In the previous studies of slotted flow meters, the repeatibility and reproducibility were studied under different flow conditions and different configurations. In accordance with these work, the present study examines the affects of the distance between the slotted plate. The preset 5D distance is expanded to the 10D. The flow coefficient, KY, the pressure drop, and the uncertainty analysis dependence upon this change is examined. There are definite changes in the results between the 5D distance and the 10D distance. As a base line, the flow coefficient, KY, showed 0.8% to 2% difference between the 5D and the 10D distance case. Depending upon the upstream flow conditions, the reproducibility of the slotted flow meter was affected. The pressure drop increased as the upstream Reynolds number increases. The result from the analysis of a water cut meter mounted downstream of a slotted flow meter showed that there are definitive relationships between the output of the water cut meter and the parameters of the flow.

Theoretical and experimental evaluation of the effects of an argon gas mixture on the pressure drop through adult tracheobronchial airway replicas

2017 ◽  
Vol 58 ◽  
pp. 217-221 ◽  
Author(s):  
Patrick D. Litwin ◽  
Anna Luisa Reis Dib ◽  
John Chen ◽  
Michelle Noga ◽  
Warren H. Finlay ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Experimental Evaluation ◽  
Gas Mixture ◽  
Argon Gas

An Analytical and Experimental Evaluation of the Pressure-Drop Losses in the Stirling Cycle

1970 ◽  
Vol 92 (2) ◽  
pp. 182-187 ◽  
Author(s):  
P. A. Rios ◽  
J. L. Smith
Keyword(s):  
Heat Exchange ◽  
Pressure Drop ◽  
Mass Flow ◽  
Experimental Evaluation ◽  
Successive Approximations ◽  
Flow Rates ◽  
The Real ◽  
Stirling Cycle ◽  
First Approximation ◽  
Mass Flow Rates

An analysis of the effects of pressure drop in the heat-exchange components of a Stirling cycle has been made and successfully applied to an experimental refrigerator. Data are presented for the indicated work per cycle for each cylinder of the machine. Two successive approximations to the real cycle are used. The first approximation is a Stirling cycle with two adiabatic cylinders and is used to compute the mass flow rates at each location. The second approximation uses these flow rates to obtain the pressure-drop losses in the heat-exchange components. The correlation between measured and calculated pressure-drop losses and individual cylinder work substantiates the validity of the analysis.

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