It. The Froude number is a number that defines fluid flow. Using dimensional analysis and showing all your workings show that the Froude number is dimensionless, given that

Froude number (Fr)= velocity of flow(u) /(acceleration due to gravity(g) x hydraulic depth(D)) ^1/2

where u is the velocity of the flow, g is the acceleration due to gravity and D is the hydraulic depth of the water.

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk