A horizontal, 25-mm-diameter cylinder is maintained at a uniform surface temperature of \(35^{\circ} \mathrm{C}\). Air at atmospheric pressure with a velocity of \(0.10 \mathrm{~m} / \mathrm{s}\) and temperature \(20^{\circ} \mathrm{C}\) is in cross flow over the cylinder. Calculate the convection heat rate per unit cylinder length. How might the cylinder be maintained at the warm temperature if its surface is adiabatic?