GATE Mechanical Engineering (ME) 2019 Shift 1 Solved Paper

Question : 19 of 65

Marks: +1, -0

For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant cross-section, the Nusselt number at constant wall heat flux

( {Nu}_{ {q}})

and that at constant wall temperature

( {Nu}_{ {T}})

are related as

${Nu}_{ {q}}> {Nu}_{ {T}}$
${Nu}_{ {q}}< {Nu}_{ {T}}$
${Nu}_{ {q}}=( {Nu}_{ {T}})^{2}$
${Nu}_{ {q}}= {Nu}_{ {T}}$

Validate

Solution:

For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant cross-section
Nusselt number at constant wall heat flux

( {Nu}_{ {q}})=4.36

Nusselt number at constant wall temperature

( {\Nu}_{ {T}})=3.66

Hence,

{\Nu}_{ {q}} > {\NuT}

Go to Question:

Prev Question

Next Question