Consider cold windy breeze parallel to your face, with an average facial dimension along the flow of 5 cm. The air velocity is 1 m/s (corresponding to 2.2 miles per hour). Assume laminar flow.
1) Calculate the thickness of the velocity boundary layer at the end of 5 cm length.
2) Calculate the thickness of the thermal boundary layer at the end of 5 cm length.
3) Provide the physical meanings of the two thicknesses in items 1) and 2).