a) \(\vec{V}.\nabla T\)
b) \(\frac{DT}{Dt}\)
c) ∇T
d) \(\frac{\partial T}{\partial t}\)
Answer: a
Explanation: \(\vec{V}.\nabla T\) (dot product of velocity vector gradient of T) is the convective derivative which is the time rate of change due to the movement of the fluid element.
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