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What is the vertical velocity required of the airflow

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Q: 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 GrL/Re2L = 0.08. Consider a heated vertical plate 0.3 m long, maintained at a surface temperature of 60°C in atmospheric air at 25°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?

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Mechanical Engineering: What is the vertical velocity required of the airflow

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