Number 6 Sing if the temperature of anobject will vary significantly in space. It depends on the following quantities:h = heat transfer coefficient [=1 W/(m2 °C)Lc = volume of object/surface area of object [=] m³/m2k = thermal conductivity [=1W/(m K)= mUse your knowledge of dimensions to determine the proper form of the Biot number,choosing from the options below.h Le(A) Bi =(B) Bi = h L. kk Le(C) Bi =hk(D) Bi =6. A biodegradable fuel having a specific gravity of 0.95 and a viscosity of 0.04 grams per cen-timeter second [g/(cm s)] is draining by gravity from the bottom of a tank. The drain line isa plastic 3-inch [in]the Reynolds number in the pipe for the system and indicate if the flow is laminar, in tran-sition, or turbulent.iameter pipe. The velocity is 5.02 meters per second [m/s]. Determine7. A sludge mixture having a specific gravity of 2.93 and a viscosity of 0.09 grams percentimeter second [g/(cm s)] is pumped from a reactor to a holding tank. The pipe is a22-inch [in] diameter pipe. The velocity is 1.8 meters per second [m/s]. Determine theReynolds number in the pipe for the system and indicate if the flow is laminar, intransition, or turbulent.= 1.02; viscosity0.0102 grams per centimeter second [g/(cm s)- Water (specific gravityis pumped through a 0.5-meter [m] diameter pipe. If the Reynolds number is 1800 for tsystem, determine the velocity of the water in units of meters per second [m/s].

Solution (6) Reynolds number of the biodegradable fuel is calculated by. Re =ρvDμv =Re ×μρD Where, ρ - is the density of water Vw - is the fluid speed D- is the pipe diameter μ - is the dynamic viscosity Substitute these values in above expression. Re = 0.95gcm3×5.02ms×100cmm×3 in×2.54cmin0.04 g(cm s)=90850 Therefore, the Reynolds number in the pipe for the system is 90850 since, Re>10,000, Hence the flow is turbulent.