Consider a $20-$mm tube with engine oil, saturated water, or ethylene glycol flowing through it$.$ If the fluid temperature is $350$ K and the flow rate is $0\mathrm{.}006$ kg$/$s$,$ find the mean velocity, hydrodynamic entry length, and thermal entry length for each fluid.$-$What is the Reynolds number is $10-$And theflow is laminar $-$ the mean velocity is $0\mathrm{.}0224$ m$/$s $-$ the hydrodynamic entrance length $0\mathrm{.}01$ m $-$ Find the thermal entrance length is $5\mathrm{.}858$ m $-$ What is the Reynolds number?