(Solved): (a) Define the boundary layer thickness, displacement thickness and momentum thickness. [Takrifkan ...
(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=70cmand width
b=3mis 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=70cmdan lebar
b=3mselari 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,band 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
