## Chapter 10

## Q. 10.2

## Step-by-Step

## Verified Solution

Gr = 158 × 0.8³ × 5 = 404

Gr/Re² = 55, so heat transfer is dominated by free convection. Assume that Nu = 0.58Gr^{0.25} . Hence Nu = 4.5 and C= 4.5\times 26\times 10^{-3} \times 5/8\times 10^{-3} = 73 \; W \ m^{-2} .