A small metal bead (radius 0.5 mm), initially 100∘C, When placed in a stream of fluid at 20∘C attains a temperature of 28∘C in4.35 second. The density and specific heat of the metal are 8500 kg/m3 and 400 J/kgK, respectively. If the bead is considered as lumped system, the convective heat transfer coefficient (in W/m2K) between the metal bead and the fluid stream

A small metal bead (radius 0.5 mm), initially 100∘C, When placed in

1.	A small metal bead (radius 0.5 mm), initially 100∘C, When placed in a stream of fluid at 20∘C attains a temperature of 28∘C in4.35 second. The density and specific heat of the metal are 8500 kg/m3 and 400 J/kgK, respectively. If the bead is considered as lumped system, the convective heat transfer coefficient (in W/m2K) between the metal bead and the fluid stream
Answer» A small metal bead (radius $0.5 m m$ ), initially $100^{\circ} C$ , When placed in a stream of fluid at $20^{\circ} C$ attains a temperature of $28^{\circ} C$ in $4.35 s e c o n d .$ The density and specific heat of the metal are $8500 k g / m^{3}$ and $400 J / k g K,$ respectively. If the bead is considered as lumped system, the convective heat transfer coefficient (in $W / m^{2} K$ ) between the metal bead and the fluid stream

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