For scientist, the Coanda effect has been an object of interest for a long time. All the time, some new applications of it are found although it has been more than a hundred years since Henri Coanda got a patent that was critical for that issue. Apart from aviation, it is more and more often used in ventilation systems to control the manner of air division and the design nozzles and ventilators. It is surprising, however, that a good command of that phenomenon and a need to apply it in different solutions did not entail a significant increase of the interest in the Coanda effect hysteresis, although it was mentioned for the first time by Newman in 1961. This article presents results of experimental measurements for a two-dimensional incompressible plane jet by an inclined plate. The hysteresis has been observed as a different jet behavior (a free jet or a jet attached to a flat plate) depending on the direction in which the plate deflection angle changes. The observed hysteresis area, defined by critical values for the αca attachment and αcd detachment angles, spanned from 8 deg to 14 deg. Its dependency on the Reynolds number has also been examined for Re ranging from 3500 to 26,500. Considering the Coanda effect hysteresis, a pressure distribution on the plate and the xR reattachment distance has been examined. The distribution of forces on a plate has been identified, which has facilitated a graphical mirroring of the Coanda effect hysteresis loop.

References

References
1.
Malicki
,
M.
,
1977
,
Wentylacja i Klimatyzacja
,
Państwowe Wydawnictwo Naukowe
,
Warszawa, Poland
.
2.
Manabu
,
I.
, and
Olusegun
,
J. I.
,
2011
,
Modeling Multiphase Material Processes Gas-Liquid Systems
,
Springer Science+Business Media
,
New York
.
3.
Feng
,
J.
, and
Joseph
,
D. D.
,
1996
, “
The Motion of a Solid Sphere Suspended by a Newtonian or Viscoelastic Jet
,”
J. Fluid Mech.
,
315
, pp.
367
385
.
4.
Aeronautics Learning Laboratory for Science, Technology and Research
,
2016
, “
Henri Marie Coanda
,” ALLSTAR Network, Miami, FL, accessed Feb. 10, 2016, http://www.allstar.fiu.edu/aero/coanda.htm
5.
IP Research Tools, Data, and Communities
,
2016
, “
Device for Deflecting a Stream of Elastic Fluid Projected Into an Elastic Fluid
,” U.S. Patent No.
US2052869 A
.http://www.google.co.in/patents/US2052869
6.
IP Research Tools, Data, and Communities
,
2016
, “
Propelling Device
,” U.S. Patent No.
US2108652 A
.http://www.google.co.in/patents/US2108652
7.
Haque
,
E.
,
Hossain
,
S.
,
Assad-Uz-Zaman
,
M.
, and
Mashud
,
M.
,
2015
, “
Design and Construction of an Unmanned Aerial Vehicle Based on Coanda Effect
,”
International Conference on Mechanical Engineering and Renewable Energy
(
ICMERE
), Chittagong, Bangladesh, Nov. 26–29, pp. 26–29.https://www.researchgate.net/publication/296443394_Design_and_Construction_of_an_Unmanned_Aerial_Vehicle_Based_on_Coanda_Effect
8.
Mirkov
,
N.
, and
Rasuo
,
B.
,
2012
, “
Manoeuvrability of an UAV with Coanda Effect Based Lift Production
,”
28th International Congress of the Aeronautical Sciences
(
ICAS
), Brisbane, Australia, Sept. 23–28, pp. 1–6.http://www.icas.org/ICAS_ARCHIVE/ICAS2012/PAPERS/617.PDF
9.
Mirkov
,
N.
, and
Rasuo
,
B.
,
2012
, “
Numerical Simulation of Air Jet Attachment to Convex Walls and Applications
,”
27th International Congress of the Aeronautical Sciences
(
ICAS
), Nice, France, Sept. 19–24, pp. 1–7.http://www.icas.org/ICAS_ARCHIVE/ICAS2010/PAPERS/621.PDF
10.
Wierciński
,
Z.
, and
Gromow
,
E.
,
2002
, “
Polepszenie rozdziału powietrza w pomieszczeniu wentylowanym za pomocą niestacjonarnego efektu Coanda
,”
Ciepłownictwo Ogrzewnictwo Went.
,
10
, pp.
27
29
.
11.
USPTO
, 2016, “
Results of Search in US Patent Collection db for Coanda
,” The United States Patent and Trademark Office, Washington, DC, accessed Feb. 10, 2016 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO% 2Fsearch-bool.html&r=0&f= S&l=50&TERM1=Coanda& FIELD1=&co1= AND& TERM2=&FIELD2=& d=PTXT
12.
Szymański
,
T.
, and
Wasiluk
,
W.
,
1999
, “
Wentylacja Użytkowa Poradnik
,” IPPU MASTA, sp. z o.o., Gdańsk, Poland.
13.
van Hooff
,
T.
,
Blocken
,
B.
,
Defraeye
,
T.
,
Carmeliet
,
J.
, and
van Heijst
,
G. J. F.
,
2012
, “
PIV Measurements and Analysis of Transitional Flow in a Reduced-Scale Model: Ventilation by a Free Plane Jet With Coanda Effect
,”
Build. Environ.
,
56
, pp.
301
313
.
14.
Valentín
,
D.
,
Guardo
,
A.
,
Egusquiza
,
E.
,
Valero
,
C.
, and
Alavedra
,
P.
,
2013
, “
Use of Coand˘a Nozzles for Double Glazed Façades Forced Ventilation
,”
Energy Build.
,
62
, pp.
605
614
.
15.
Cao
,
G.
,
2009
, “
Modeling the Attached Plane Jet in a Room
,”
Ph.D. dissertation
, Helsinki University of Technology, Espoo, Finland.https://aaltodoc.aalto.fi/handle/123456789/4696
16.
Kołaszewski
,
A.
,
2003
, “
Nawiew powietrza do hal basenowych przez nawiewne szyny szczelinowe
,”
Klimatyzacja i chłodnictwo
,
7
(8), pp. 20–23.
17.
Olivotto
,
C
.,
2010
, “
Fluidic Elements based on Coanda Effect
,”
Anniversary Session ‘Celebrating 100 Year of the First Jet Aircraft Invented by Henri Coanda
,’ Bucharest, Romania, Dec. 14, pp. 163–172.http://bulletin.incas.ro/files/constantin_olivotto_v2no4_full.pdf
18.
Wierciński
,
Z.
, and
Gromow
,
E.
,
2003
, “
Wykorzystanie Histerezy Efektu Coanda do Polepszenia Wentylacji Mieszania
,”
Ciepłownictwo Ogrzewnictwo Went.
,
9
, pp.
20
23
.
19.
Alekseenko
,
S. V.
, and
Markovich
,
D. M.
,
1997
, “
Reattachment of a Plane Turbulent Jet to a Wall Upon Injection and Suction
,”
J. Appl. Mech. Tech. Phys.
,
38
(
3
), pp.
417
422
.
20.
Newman
,
B. G.
,
1961
,
The Deflexion of Plane Jet by Adjacent Boundaries—Coanda Effect
,
G. V.
Lachman
, ed.,
Pergamon Press
,
Oxford, UK
.
21.
Sawyer
,
R. A.
,
1963
, “
Two-Dimensional Reattaching Jet Flows Including the Effects of Curvature on Entrainment
,”
J. Fluid Mech.
,
17
(
4
), pp.
481
498
.
22.
Levin
,
S. G.
, and
Manion
,
F. M.
,
1962
, “
Jet Attachment Distance as a Function of Adjacent Wall Offset and Angle
,”
Harry Diamond Laboratories
, Washington, DC, Report No.
HDL-TR-1087
http://www.dtic.mil/dtic/tr/fulltext/u2/297895.pdf.
23.
Miozzi
,
M.
,
Lalli
,
F.
, and
Romano
,
G. P.
,
2010
, “
Experimental Investigation of a Free-Surface Turbulent Jet With Coanda Effect
,”
Exp. Fluids
,
49
(
1
), pp.
341
353
.
24.
Lai
,
J. C. S.
, and
Lu
,
D.
,
1996
, “
Effect of Wall Inclination on the Mean Flow and Turbulence Characteristics in a Two-Dimensional Wall Jet
,”
Int. J. Heat Fluid Flow
,
17
(
4
), pp.
377
385
.
25.
Nasr
,
A.
, and
Lai
,
J. C. S.
,
2010
, “
The Effect of Wall Inclination on an Inclined Offset Jet
,”
Tenth International Symposium on Applications of Laser Techniques to Fluid Mechanics
, Lisbon, Portugal, July 10–13.http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2000/papers/pdf/14_5.pdf
26.
Fiser
,
J.
,
Jedelsky
,
J.
,
Vach
,
T.
,
Forman
,
M.
, and
Jicha
,
M.
,
2012
, “
Comparison of CFD Simulations and Measurements of Flow Affected by Coanda Effect
,”
EPJ Web of Conferences
, Turunç-Marmaris, Turkey, July 4–14, Paper No.
01015
.
27.
Allery
,
C.
,
Guerin
,
S.
,
Hamdouni
,
A.
, and
Sakout
,
A.
,
2004
, “
Experimental and Numerical POD Study of the Coanda Effect Used to Reduce Self-Sustained Tones
,”
Mech. Res. Commun.
,
31
(
1
), pp.
105
120
.
28.
Dumas
,
A.
,
Subhash
,
M.
,
Trancossi
,
M.
, and
Marques
,
J. P.
,
2014
, “
The Influence of Surface Temperature on Coanda Effect
,”
Energy Procedia
,
45
, pp.
626
634
.
29.
Deo
,
R. C.
,
Mi
,
J.
, and
Nathan
,
G. J.
,
2007
, “
The Influence of Nozzle Aspect Ratio on Plane Jets
,”
Exp. Therm. Fluid Sci.
,
31
(
8
), pp.
825
838
.
30.
Kechiche
,
J.
,
Mhiri
,
H.
,
Le Palec
,
G.
, and
Bournot
,
P.
,
2004
, “
Numerical Study of the Inlet Conditions on a Turbulent Plane Two Dimensional Wall Jet
,”
Energy Conv. Manage.
,
45
(
18–19
), pp.
2931
2949
.
31.
Dragan
,
V.
,
2001
, “
A Parametric Study of a Thick, Incompressible Flow Over a Curved Surface
,”
INCAS Bull.
,
3
(
4
), pp. 2066–8201.
32.
Faghani
,
E.
, and
Rogak
,
S. N.
,
2012
, “
Application of CFD and Phenomenological Models in Studying Interaction of Two Turbulent Plane Jets
,”
Int. J. Mech. Eng. Mechatronics
,
1
(
2
), pp.
36
49
.
33.
Wang
,
X. K.
, and
Tan
,
Ć S. K.
,
2007
, “
Experimental Investigation of the Interaction Between a Plane Wall Jet and a Parallel Offset Jet
,”
Exp. Fluids
,
42
(
4
), pp.
551
562
.
34.
Trancossi
,
M.
,
2011
, “
An Overview of Scientific and Technical Literature on Coanda Effect Applied to Nozzles
,”
SAE
Paper No. 2011-01-2591.
35.
Vanierschot
,
M.
, and
van den Bulck
,
E.
,
2007
, “
Influence of the Nozzle Geometry on the Hysteresis of Annular Swirling Jets
,”
Combust. Sci. Technol.
,
179
(
8
), pp.
1451
1466
.
36.
Vanierschot
,
M.
, and
van den Bulck
,
E.
,
2009
, “
Computation of a Drastic Flow Pattern Change in an Annular Swirling Jet Caused by a Small Decrease in Inlet Swirl
,”
Int. J. Numer. Methods Fluids
,
59
(
5
), pp.
577
592
.
37.
Vanierschot
,
M.
,
Persoons
,
T.
, and
van den Bulck
,
E.
,
2009
, “
A New Method for Annular Jet Control Based on Cross-Flow Injection
,”
Phys. Fluids
,
21
(
2
), p.
025103
.
38.
Vanierschot
,
M.
, and
van den Bulck
,
E.
,
2007
, “
Hysteresis in Flow Patterns in Annular Swirling Jets
,”
Exp. Therm. Fluid Sci.
,
31
(
6
), pp.
513
524
.
39.
Vanierschot
,
M.
, and
van den Bulck
,
E.
,
2007
, “
Numerical Study of Hysteresis in Annular Swirling Jets With a Stepped‐Conical Nozzle
,”
Int. J. Numer. Methods Fluids
,
54
(
3
), pp.
313
324
.
40.
Trávníček
,
Z.
, and
Tesař
,
V.
,
2013
, “
Hysteresis in Annular Impinging Jets
,”
Exp. Therm. Fluid Sci.
,
44
, pp.
565
570
.
41.
Falese
,
M.
,
Gicquel
,
L. Y.
, and
Poinsot
,
T.
,
2014
, “
LES of Bifurcation and Hysteresis in Confined Annular Swirling Flows
,”
Comput. Fluids
,
89
, pp.
167
178
.
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