Solution Manual Heat And Mass Transfer Cengel 5th Edition Chapter 9

Two vertical plates separated by distance $L_c$ with a temperature difference.

For air, $Pr \approx 0.72$, so the denominator term $[1 + (0.492/Pr)^9/16]^4/9 \approx 1.06$. Simplifying for air (or solving strictly): Two vertical plates separated by distance $L_c$ with

Natural convection, or free convection, occurs when a fluid (like air or water) contacts a surface at a different temperature. The resulting temperature gradient causes density variations; for example, air near a hot radiator becomes less dense and rises, while cooler, denser air sinks to take its place. This motion, known as a , significantly enhances heat transfer compared to pure conduction. Key Concepts and Mathematical Foundations $Pr \approx 0.72$