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Problem $09\mathrm{.}094-$ A Rectangular Enclosure Consisting of Two Surfaces Separated by an Air Gap

Consider a $3-$m$-$high rectangular enclosure consisting of two surfaces separated by an air gap $(L)=0\mathrm{.}18-m$ at $1$ atm $.$ The surface temperatures across the air gap are $30C$ and $-10C.$ The properties of air at $T_f=\frac{T_S+T_{}}{2}=10C$ are $k=0\mathrm{.}02439\frac{W}{m}*K,v=1\mathrm{.}426{10}^{-5}\frac{m^2}{s},Pr=0\mathrm{.}7336,$ and $=\frac{1}{T_f}=3\mathrm{.}534{10}^{-3}{K}^{-1}.$ DETERMINE THE RATIO OF HEAT TRANSFER RATE FOR THE HORIZONTAL ORIENTATION TO THAT FOR VERTICAL ORIENTATION