Dimensional analysis modeling of spraying operation – Impact of fluid properties and pressure nozzle geometric parameters on the pressure-flow rate relationship

2020 ◽  
Vol 163 ◽  
pp. 36-46 ◽  
Author(s):  
K. Lachin ◽  
C. Turchiuli ◽  
V. Pistre ◽  
G. Cuvelier ◽  
S. Mezdour ◽  
...  
Keyword(s):  
Dimensional Analysis ◽  
Flow Rate ◽  
Geometric Parameters ◽  
Pressure Flow ◽  
Rate Relationship ◽  
Fluid Properties ◽  
Pressure Nozzle

scholarly journals Characterization of venturi injector using dimensional analysis

2019 ◽  
Vol 23 (7) ◽  
pp. 484-491 ◽  
Author(s):  
Luiz R. Sobenko ◽  
José A. Frizzone ◽  
Antonio P. de Camargo ◽  
Ezequiel Saretta ◽  
Hermes S. da Rocha
Keyword(s):  
Dimensional Analysis ◽  
Flow Rate ◽  
Injection Rate ◽  
Operating Conditions ◽  
Functional Tests ◽  
Injection Flow Rate ◽  
Injection Flow ◽  
Hydraulic Conditions ◽  
Fluid Properties ◽  
Pi Theorem

ABSTRACT Venturi injectors are commonly employed for fertigation purposes in agriculture, in which they draw fertilizer from a tank into the irrigation pipeline. The knowledge of the amount of liquid injected by this device is used to ensure an adequate fertigation operation and management. The objectives of this research were (1) to carry out functional tests of Venturi injectors following requirements stated by ISO 15873; and (2) to model the injection rate using dimensional analysis by the Buckingham Pi theorem. Four models of Venturi injectors were submitted to functional tests using clean water as motive and injected fluid. A general model for predicting injection flow rate was proposed and validated. In this model, the injection flow rate depends on the fluid properties, operating hydraulic conditions and geometrical characteristics of the Venturi injector. Another model for estimating motive flow rate as a function of inlet pressure and differential pressure was adjusted and validated for each size of Venturi injector. Finally, an example of an application was presented. The Venturi injector size was selected to fulfill the requirements of the application and the operating conditions were estimated using the proposed models.

scholarly journals A Fluid Mechanical Interpretation of Hysteresis in Rhinomanometry

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
T. F. Groß ◽  
F. Peters
Keyword(s):  
Flow Rate ◽  
Fluid Mechanic ◽  
Storage Effect ◽  
Clinical Tests ◽  
Nasal Breathing ◽  
Pressure Flow ◽  
Rate Relationship ◽  
Mechanical Interpretation ◽  
Set Up ◽  
Relationship Of

A hysteresis effect in the pressure/flow rate relationship of nasal breathing has frequently been observed in clinical tests and in lab investigations. Explanations that have been given in the literature are missing a fluid mechanic storage effect coming into play in reciprocating flows. This effect depends primarily on the way the rhinomanometric measurements are set up and not so much on the nose flow itself. This is to be shown by calculations and experiments. The experiments are carried out with orifices because they can represent nose flow and are often implemented in rhinomanometric equipment as flow gauges. To mimic reality also a 1 : 1 nose model is used. It is shown where the hysteresis comes from and what the key parameters for its prediction are. With these results hysteresis in nasal breathing appears in a new light.

Pressure-Flow Characteristics During Peristaltic Transport of Non-Newtonian Fluid in Distensible Tube With Different Wave Forms

2003 ◽  
Author(s):  
Prasanna Hariharan ◽  
Rupak K. Banerjee
Keyword(s):  
Newtonian Fluid ◽  
Flow Rate ◽  
Flow Characteristics ◽  
Pressure Flow ◽  
Square Wave ◽  
Wall Movement ◽  
Power Law Fluids ◽  
Significant Difference ◽  
Wave Forms ◽  
Distensible Tube

This study analyzes the pressure-flow characteristics during the peristaltic pumping of power law fluids in an axi-symmetric non-uniform distensible tube. The analyzed geometry is of a diverging shape that is common in several biological flow conduits, especially in mammals. Using the Fourier series, the dimensionless wall coordinates for sinusoidal, triangular, trapezoidal, and square wave forms are obtained to simulate wall movement. Equations expressing the pressure-flow rate relationship for different wall shapes are developed from the wave equation. Pressure-flow and velocity plots are obtained by solving the equations numerically. The results indicate that there is significant difference in pressure-flow relationship between Newtonian and non-Newtonian fluid. Also, the maximum flow rate can be achieved when the wall movement follows a square wave form.

Flap size/flow rate relationship in perforator flaps and its importance in DIEAP flap drainage

2009 ◽  
Vol 62 (12) ◽  
pp. 1666-1670 ◽  
Author(s):  
C. Rubino ◽  
V. Ramakrishnan ◽  
A. Figus ◽  
A. Bulla ◽  
V. Coscia ◽  
...  
Keyword(s):  
Flow Rate ◽  
Perforator Flaps ◽  
Rate Relationship
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