Not sure if I'm getting this right, my answer seems very small, can anyone advise?(adsbygoogle = window.adsbygoogle || []).push({});

Question- butanol at a temperature of 28^{o}C is pumped at a velocity of 14ms-1 through a 100mm diameter tube kept at a wall temp of 90^{o}C. The properties of butanol are below. Determine the convective heat transfer coefficient.

Data:

Specific heat capacity - 2.142kJkg^{-1}K^{-1}

ρ 950kgm^{-1}

Dynamic viscosity at 28^{o}C - 2.9x10^{-3}kgm^{-1}s^{-1}

Dynamic viscosity at 90^{o}C- 1.2x10^{-3}kgm^{-1}s^{-1}

Thermal conductivity - 2.4x10^{-4}kWm^{-1}K^{-1}

Attempt:

Re=pUd/μ

Pr=Cpμ/K

Nu=0.332Re^{0.5}Pr^{0.33}

hx=Nu(k/x)

Re=950*14*0.1x10^{-3}/2.9x10^{-3}458.62x10-4

Pr=2.142x2.9x^{-3}/2.41x10^{-4}2.588

Nu=0.332x(458.62x10-4)^{0.5}x(2.588)^{0.33}0.0973

Hx=0.0973*2.41x10^{-4}/0.12.3352x10^{-4}kWm^{-2}K^{-1}

Answer: 0.2335Wm^{-2}K^{-1}

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# Convective heat transfer coefficient

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