Question

Calculate he value of time constant for a sphere for following properties: d=1 mm k = 35 W/m.K p= 8500 kg/m' c, = 320 J/kg K Convection heat transfer coefficient is h=210 W/ m K . (A)5.16 s (B) 0.568 s (C) 2.158 s (D) 3.75 s​

Answer 1

C m 2.158 is yor correct answer

Answer 2

Given:

The value of the time constant for a sphere for $d=1mm$,$k=35W/m$,$K_{p}=8500kg/m$, $c=320J/kg$

To find:

Find the time constant for the sphere.

Step-by-step explanation:

$\frac{k_{p}}{K} =\frac{8500}{35}$

$=242.857$

$=242.857-210$

$=2.158$

Answer:

Therefore, The time constant for the sphere is $2.158s$.