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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}/0.1

**2.3352x10**

Answer: 0.2335

^{-4}kWm^{-2}K^{-1}Answer: 0.2335

**Wm**^{-2}K^{-1}