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=Pressure-swirl spray in a low-turbulence cross-flow=
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__NOTOC__
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= Description of Study Test Case =
= Description of Study Test Case =
This section should:
The conical liquid sheet produced by water spraying from a PSA was investigated in cross-flow of non-heated, non-pressurised air. See '''[https://kbwiki.ercoftac.org/w/index.php/EXP_1-1#figure1 Figure 1b]''', which shows the atomizer in the test section. The atomizer was operated continuously in cold-flow (non-reacting) conditions. It generated a water spray at inlet pressure, <math>p_{\text {in}}</math>, of 0.5 MPa. The flow conditions of the atomizer are described by Reynolds number: <br/> <br/>
* Convey the general set-up of the test case configuration (e.g. airflow over a bump on the floor of a wind tunnel)
<div id="eqn14">
* Describe the geometry, illustrated by a sketch
{{NumBlk|:|<math>
* Specify the flow parameters which define the flow regime (e.g. Reynolds number, Rayleigh number, angle of incidence etc.)
R e_{\text {in}}=\rho_{\text {in}} u_{\text {in}} D_{\text {in}} / \mu
* give the principal quantities of interest that were measured - these should include global parameters but also mean-flow and turbulence parameters.
</math>|{{EquationRef|14}}}}
</div>
<br/>
where <math>\rho_l</math> is the liquid density, <math>u_{\text {in}}=Q_{\text {l}}/A_{\text {in}}</math> is the liquid velocity at inlet ports and <math>D_{\text {in}}=\sqrt{4A_{\text {in}}/\pi}</math> is the hydraulic diameter of the inlet ports (for atomizer details see '''[https://kbwiki.ercoftac.org/w/index.php/EXP_1-1_Experimental_Set_Up#figure7 Figure 7]''' and corresponding text in section ''[[EXP_1-1__Experimental_Set_Up|Experimental Set Up]]''). The <math>R e_{\text {in}}=1330</math>. The presented case is one of three inlet pressure cases (<math>p_{\text {in }}= \mathrm 0.25, 0.5, 1 </math> <math> \mathrm {MPa} </math>) measured and studied in <ref name="Cejpek2"> O. Cejpek, M. Maly, J. Slama, M. M. Avulapati, and J. Jedelsky, Continuum Mechanics and Thermodynamics 34 (6), 1497 (2022) </ref>.
The interaction of the spray with the cross-flowing air is controlled by the ratio of the momentum of liquid to the air momentum, <math>q</math> (see '''[https://kbwiki.ercoftac.org/w/index.php/EXP_1-1_Introduction#math_10 Equation 10]''') and by the Weber number which relies on the surface tension forces of the liquid film with the drag forces of the airflow, <math>We_a</math> ('''[https://kbwiki.ercoftac.org/w/index.php/EXP_1-1_Introduction#math_11 Equation 11]''') or <math>We_r</math> ('''[https://kbwiki.ercoftac.org/w/index.php/EXP_1-1_Introduction#math_12 Equation 12]'''). <math>We</math> and <math>q</math> values for the experimental regimes are given in '''[[#table2|Table 2]]'''.


<br/>
<div id="table2">
{| class="wikitable" style="text-align:center;margin:auto"
|- style="font-weight:bold; background-color:#c0c0c0;"
|+ '''Table 2''' Experimental regimes,  basic characteristics of the flow and spray
! <br /><math>u_{cf}</math> [m/s]
! <br /><math>p_{in}</math> [MPa]
! <br /><math>Q_{l}</math> [L/hour]
! <br /><math>C_{D}</math> [–]
! <br /><math>We_{a}</math>  [–]
! <br /><math>We_{r}</math> [–]
! <br /><math>q</math>  [–]
|-
| <br />0
| <br />0.508
| <br />6.71
| <br />0.44
| <br />0.0
| <br />0.5
| <br />∞
|-
| <br />8
| <br />0.498
| <br />6.72
| <br />0.43
| <br />0.5
| <br />0.85
| <br />3642.0
|-
| <br />16
| <br />0.491
| <br />6.68
| <br />0.42
| <br />1.8
| <br />1.5
| <br />938.8
|-
| <br />32
| <br />0.493
| <br />6.69
| <br />0.43
| <br />7.1
| <br />3.4
| <br />227.1
|-
|}
</div>
== References ==
<references/>


The description can be kept fairly short if reference can be made to a publication or a link to a data base where details are given. For other cases a more detailed, self-contained description should be provided.
<br/>
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{{ACContribs
|authors=Ondrej Cejpek, Milan Maly, Jan Jedelsky
|authors=Ondrej Cejpek, Milan Maly, Ondrej Hajek, Jan Jedelsky
|organisation=Brno University of Technology
|organisation=Brno University of Technology
}}
}}
{{EXPHeaderLib
{{EXPHeader
|area=1
|area=1
|number=1
|number=1

Latest revision as of 08:22, 17 August 2023

Pressure-swirl spray in a low-turbulence cross-flow

Front Page

Introduction

Review of experimental studies

Description

Experimental Set Up

Measurement Quantities and Techniques

Data Quality and Accuracy

Measurement Data and Results

Description of Study Test Case

The conical liquid sheet produced by water spraying from a PSA was investigated in cross-flow of non-heated, non-pressurised air. See Figure 1b, which shows the atomizer in the test section. The atomizer was operated continuously in cold-flow (non-reacting) conditions. It generated a water spray at inlet pressure, , of 0.5 MPa. The flow conditions of the atomizer are described by Reynolds number:

 

 

 

 

(14)


where is the liquid density, is the liquid velocity at inlet ports and is the hydraulic diameter of the inlet ports (for atomizer details see Figure 7 and corresponding text in section Experimental Set Up). The . The presented case is one of three inlet pressure cases ( ) measured and studied in [1]. The interaction of the spray with the cross-flowing air is controlled by the ratio of the momentum of liquid to the air momentum, (see Equation 10) and by the Weber number which relies on the surface tension forces of the liquid film with the drag forces of the airflow, (Equation 11) or (Equation 12). and values for the experimental regimes are given in Table 2.


Table 2 Experimental regimes, basic characteristics of the flow and spray

[m/s]
[MPa]
[L/hour]
[–]
[–]
[–]
[–]

0
0.508
6.71
0.44
0.0
0.5
∞

8
0.498
6.72
0.43
0.5
0.85
3642.0

16
0.491
6.68
0.42
1.8
1.5
938.8

32
0.493
6.69
0.43
7.1
3.4
227.1

References

  1. ↑ O. Cejpek, M. Maly, J. Slama, M. M. Avulapati, and J. Jedelsky, Continuum Mechanics and Thermodynamics 34 (6), 1497 (2022)


Contributed by: Ondrej Cejpek, Milan Maly, Ondrej Hajek, Jan Jedelsky — Brno University of Technology

Front Page

Introduction

Review of experimental studies

Description

Experimental Set Up

Measurement Quantities and Techniques

Data Quality and Accuracy

Measurement Data and Results


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