According to experimental results for parallel airflow over a uniform temperature, heated vertical plate, the effect of free convection on the heat transfer convection coefficient will be \(5 \%\) when \(G r_{L} / R e_{L}^{2}=0.08\). Consider a heated vertical plate \(0.5 \mathrm{~m}\) long, maintained at a surface temperature of \(55^{\circ} \mathrm{C}\) in atmospheric air at \(30^{\circ} \mathrm{C}\). What is the minimum vertical velocity required of the airflow such that free convection effects will be less than \(5 \%\) of the heat transfer rate?