RUKUS magazine March 2009 issue with cover model Crystal Mantecon. Featured girls are Chelsea Brooke, Alexia Rochelle and Minnie Gupta. Music reviewed for this issue is The Binges; Self Titl…Descripción completa
Fluid Mech 2 Formulae SheetFull description
Full description
Full description
theory of automataFull description
Full description
Photoshop users magazine.
Answer keyFull description
Lab reportFull description
2135Full description
Full description
brazil
Descripción: Ides Of March - Vehicle
marcjoftherdsmrFull description
Father of Victory MarchDescripción completa
The March 2009 Issue of ITALY Magazine covering subjects ranging from travel to Italy, property in Italy, Italian recipes
Department of Mechanical Engineering National University of Singapore
ME 2135 – Fluid Mechanics II– Quiz – Dilip !hah Time Allocated: 40 Minutes
Instructions to Candidates: 1. 2. ". 4.
Answ Answer er ALL ALL quest questio ions ns.. This quiz quiz is equival equivalent ent to 10 10 o! the the course course total total score. score. #nter onl$ onl$ $our metric metric num%er num%er on the to& to& ri'ht corner corner o! this this &a'e. &a'e. (ou are allowe allowed d to re!er re!er to $our $our class lectur lecturee notes. notes.
Q.1 Consider two geometrically similar centrifugal pumps. ne of the pumps !pump 2" is four times larger than the other !pump 1"# i.e. D2 = 4 D1. $oth pumps operate at their BEP point. (i) %f &oth pumps pump water and use the same power # estimate the ratio of flow'rates through the two pumps# i.e. Q1 (Q2. (ii) Compare the rotation rates of the two pumps under these conditions# i.e. N2 / N1. (4 marks) )he non dimensional varia&les are CQ*Q(ND+ , C-*g-(ND and C/*/(0N+D.
2iven3 D * 4D1
5t $E/# C-# CQ and C/ will &e the same for the two pumps. 5lso given is /1 * / . )herefore# C/1 * C/ implies P 1 " ) ρ N 1 D1
=
P 2 "
)
ρ N 2 D2
"
)
N D1 ⇒ 2 = D N 1 2 Therefore
Also C Q1
Q2 Q1
N 2 N 1
)
1 " = = 0.0++ 4
= C Q 2
N 2 D2
"
−4
D1 = = N 1 D1 D2
"
= *.")
′− ∂ − −
Q. )he stream function for an irrotational flow field is given &y
(
ψ = Λ r π α sin π θ where 6 and 7 are constants. Derive the potential α
function for this flow field. Determine the stream function and potential function for 7 * 8(. 9or what value of 7# the given stream function may represent a uniform flow: (6 marks)
u r 1r r r 1 r r Therefore
r cosand v cos f 1 r sin cos f - r , r cos 1
For
α
=
π
2
/
Ψ = Λr 2 sin- 2θ , = 2Λr sin θ cos θ = 2Λ xy Φ = Λr 2 cos- 2θ , = Λr 2 (cos 2 θ − sin 2 θ ) = Λ( x 2 − y 2 ) π
