Which of the following number ratio signifies the type of convection i.e. free convection or forced convection.

\frac{R e^{2}}{G r}

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\frac{G r}{R e}

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\frac{R e}{G r}

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\frac{G r}{R e^{2}}

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Solution

The correct option is D $\frac{G r}{R e^{2}}$
$\frac{G r}{R e^{2}} s i g n i f i e s t h e t y p e o f c o n v e c t i o n$

$\frac{G r}{R e^{2}} << 1, f o r c e d c o n v e c t i o n$

$\frac{G r}{R e^{2}} >> 1, f r e e c o n v e c t i o n$

$\frac{G r}{R e^{2}} ≃ 1, m i x e d c o n v e c t i o n$

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