Experimental evaluation of the drag coefficient of water rockets by a simple free-fall test

2009 ◽  
Vol 30 (5) ◽  
pp. 1039-1048 ◽  
Author(s):  
R Barrio-Perotti ◽  
E Blanco-Marigorta ◽  
K Argüelles-Díaz ◽  
J Fernández-Oro
Keyword(s):  
Drag Coefficient ◽  
Experimental Evaluation ◽  
Free Fall

An Experimental Evaluation of Drag Coefficient for Rectangular Cylinders Exposed to Grid Turbulence

1982 ◽  
Vol 104 (4) ◽  
pp. 523-527 ◽  
Author(s):  
J. Courchesne ◽  
A. Laneville
Keyword(s):  
Drag Coefficient ◽  
Experimental Evaluation ◽  
Grid Turbulence ◽  
Two Dimensional ◽  
Secondary Role ◽  
The Mean ◽  
Rectangular Cylinders

This paper describes an experimental evaluation of the effects of the intensity and scale of turbulence on the drag coefficient of two-dimensional rectangular cylinders exposed to grid turbulence. It is observed that the mean drag coefficient is principally influenced, for a given cylinder, by the intensity of turbulence and that the scale of turbulence plays a secondary role.

A Comparison of Correction Methods Used in the Evaluation of Drag Coefficient Measurements for Two-Dimensional Rectangular Cylinders

1979 ◽  
Vol 101 (4) ◽  
pp. 506-510 ◽  
Author(s):  
J. Courchesne ◽  
A. Laneville
Keyword(s):  
Drag Coefficient ◽  
Experimental Evaluation ◽  
Uniform Flow ◽  
Two Dimensional ◽  
Rectangular Cylinders

This paper describes an experimental evaluation of available drag correction formulae and theories for blockage effects applicable to two-dimensional rectangular cylinders immersed in a low-turbulence uniform flow. It is observed that empirical formulae are functions of the afterbody length and that Maskell’s theory has the tendency to overestimate the correction.

Explicit relationships for the terminal velocity of spherical particles

1990 ◽  
Vol 55 (2) ◽  
pp. 403-408 ◽  
Author(s):  
Miloslav Hartman ◽  
Václav Veselý ◽  
Karel Svoboda ◽  
Vladimír Havlín
Keyword(s):  
Drag Coefficient ◽  
Free Fall ◽  
Terminal Velocity ◽  
Spherical Particles ◽  
Wide Range ◽  
Archimedes Number

The Turton-Levenspiel correlation for the drag coefficient of a sphere is employed to compare recently proposed explicit equations to predict the free-fall conditions. Predictions of four different expressions are explored over a wide range of Archimedes number.

Influence of Particle Shape on the Drag Coefficient for Isometric Particles

1994 ◽  
Vol 59 (12) ◽  
pp. 2583-2594 ◽  
Author(s):  
Miloslav Hartman ◽  
Otakar Trnka ◽  
Karel Svoboda ◽  
Václav Veselý
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Drag Coefficient ◽  
Fluidized Beds ◽  
Fluid Velocity ◽  
Particle Diameter ◽  
Free Fall ◽  
Fall Velocity ◽  
Gas Cleaning ◽  
Explicit Formulae

A comprehensive correlation has been developed of the drag coefficient for nonspherical isometric particles as a function the Reynolds number and the particle sphericity on the basis of data reported in the literature. The proposed formula covers the Stokes, the transitional and the Newton region. The predictions of the reported correlation have been compared to experimental data measured in this work with the dolomitic materials in respect to their use in calcination and gas cleaning processes with fluidized beds. Approximative explicit formulae have also been reported that make it possible to estimate the terminal free-fall velocity of a given particle or to predict the particle diameter corresponding to a fluid velocity of interest.

scholarly journals Preliminary study of software tracker usage to analyze inhibitory style on free fall movie events

2018 ◽  
Vol 197 ◽  
pp. 02012
Author(s):  
Seni Susanti ◽  
Ea Cahya Septia Mahen ◽  
Ade Yeti Nuryantini
Keyword(s):  
Drag Coefficient ◽  
Drag Force ◽  
Free Fall ◽  
Force Analysis ◽  
Drag Coefficients ◽  
Drag Forces ◽  
Preliminary Study ◽  
Free Falling ◽  
Good Agreement

This paper presents drag force analysis of free falling object using software tracker. We use video cupclips that have been embedded in this software. The video featured cupcakes to which hung a number of different paper clips were dropped simultaneously. We track the trajectory of free falling cupclips using the software to get the information of position, speed, and acceleration of each cupcake against time. From the data we get the value of drag forces and drag coefficients for each time. The result shows that the drag force value increased to almost constant value, otherwise the drag coefficient is reduced to almost constant values well. According to the results, the analyzed data has good agreement with the theory. Thus, software tracker can be used as media to learn drag force easily and inexpensively.

Free-Fall of Solid Particles through Fluids

1993 ◽  
Vol 58 (5) ◽  
pp. 961-982 ◽  
Author(s):  
Miroslav Hartman ◽  
John G. Yates
Keyword(s):  
Drag Coefficient ◽  
Newtonian Fluid ◽  
Free Fall ◽  
Terminal Velocity ◽  
Solid Particles ◽  
Fall Velocity ◽  
Predictive Relationships ◽  
Implicit And Explicit

A comprehensive, up-to-date review is presented of predictive relationships for the terminal, free-fall velocity of solid particles falling in an infinite Newtonian fluid. The study explores accuracy of the implicit and explicit equations in terms of the drag coefficient and the terminal velocity. Problems of predicting the terminal velocity of non-spherical, isometric as well as non-isometric, particles is discussed.

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