Any good expert know good only 100% sure expert do it

Air at 300K and 1 bar enters from a 900 elbow connected to a channel with surface of constant temperature of 600K. Estimate the outlet temperature of the fluid at the following conditions: a) The channel is assumed smooth and has dimensions of 3" NPS and length of 0.8 m. The flowrate of air is 0.05 kg/s b) The channel is not assumed smooth. For other conditions, use (a). c) Using conditions of (b) but the length of the channel is 4 m. d) The channel is 1 cm wide, 0.5 m high and 0.8 m long and the flowrate of air is 0.05 kg/s. *Guide: Hydraulic diameter as characteristic dimension e) Using conditions of (d) except that the flowrate is 3.6 kg/hr. *Guide: us , ub f) Using conditions of (d) except the length is 1.5 m. *Guide: Hydraulic diameter as characteristic dimensionAir at 300K and 1 bar enters from a 900 elbow connected to a channel with surface of constant temperature of 600K. Estimate the outlet temperature of the fluid at the following conditions: a) The channel is assumed smooth and has dimensions of 3" NPS and length of 0.8 m. The flowrate of air is 0.05 kg/s b) The channel is not assumed smooth. For other conditions, use (a). c) Using conditions of (b) but the length of the channel is 4 m. d) The channel is 1 cm wide, 0.5 m high and 0.8 m long and the flowrate of air is 0.05 kg/s. *Guide: Hydraulic diameter as characteristic dimension e) Using conditions of (d) except that the flowrate is 3.6 kg/hr. *Guide: us , ub f) Using conditions of (d) except the length is 1.5 m. *Guide: Hydraulic diameter as characteristic dimension