(a) Define the boundary layer thickness, displacement thickness and momentum thickness.
[Takrifkan ketebalan, ketebalan anjakan dan ketebalan momentum lapisan sempadan.]
(3 Marks/Markah)
(b) Describe the formation of boundary layer.
[Jelaskan pembentukan lapisan sempadan.]
(4 Marks/Markah)
(c) A sharp of flat plate with length
L=70cm and width
b=3m is parallel to air stream of velocity
U=4.5(m)/(s). Given density of air
\rho =1.2k(g)/(m^(3)) and kinematic viscosity of air
v=1.5\times 10^(-5)(m^(2))/(s). [Plat rata yang tajam dengan panjang
L=70cm dan lebar
b=3m selari dengan aliran udara dengan kecepatan
U=4.5(m)/(s). Diberi ketumpatan udara
\rho =1.2k(g)/(m^(3)) dan kelikatan kinematik udara
v=1.5\times 10-5(m^(2))/(s).]
(i) Calculate the boundary layer thickness, displacement thickness and momentum thickness.
[Kirakan ketebalan, ketebalan anjakan dan ketebalan momentum lapisan sempadan.]
(3 Marks/Markah)
(ii) Determine the skin friction coefficient and shear stress on the surface of the plate. [Tentukan pekali geseran kulit dan tegasan ricih pada permukaan plat.]
(4 Marks/Markah)
(iii) Estimate the drag force on one side of the plate.
[Anggarkan daya seret pada satu sisi plat.]
(4 Marks/Markah)
(d) The air stream Question 1(c) was replaced with water stream, where
L,b and U will remain similar. Given density of water
\rho =1000k(g)/(m^(3)) and kinematic viscosity of water
v=1.005\times 10^(-6)(m^(2))/(s).
[Aliran udara Soalan 1(c) diganti dengan aliran air, di mana L , b dan U akan kekal sama. Diberi ketumpatan air
\rho =1000k(g)/(m^(3)) dan kelikatan kinematik air
v=1.005\times 10^(-6)(m^(2))/(s).]
(i) Determine the Reynold number and what types of the boundary layer would be developed?
[Tentukan nombor Reynold dan jenis lapisan sempadan yang akan dibina?]
(3 Marks/Markah)
(ii) Compare the drag force on one side of the plate with Question 1(c). [Bandingkan daya seret pada satu sisi plat dengan Soalan 1(c).]
(4 Marks/Markah)
PLEASE ANSWER THIS QUESTION WITH ALL FULL STEPS WRITE PROPERLY
