Determine the boundary layer thickness, the wall shear stress of a laminar water flow over a flat plate. the free stream velocity is 1 m/s, the kinematic viscosity of the water is 106 m/s. the density of the water is 1,000 kgm3. the transition reynolds number re u/ 5x10 determine the distance downstream of the leading edge when the boundary transitions to turbulent. determine the total frictional drag produced by the laminar and turbulent portions of the plate which is 1m long. if the free stream and plate temperatures are 100 c and 25°c, respectively, determine the heat transfer rate from the plate.

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c