Engineering Properties of Grains

Thermal diffusivity $\alpha$ of a grain bulk with thermal conductivity $k$, density $\rho$, and specific heat $c_p$ is defined as:

Options:

• (A) $\alpha = \frac{k}{\rho c_p}$
• (B) $\alpha = \frac{\rho c_p}{k}$
• (C) $\alpha = k \rho c_p$
• (D) $\alpha = \frac{k c_p}{\rho}$