engineering recuitment NMDC Junior Officer (Trainee) Mock Test 2024 Heat Transfer Conduction Heat Conduction Through Hollow and Composite Sphere
If the inner and outer walls of a sphere having surface areas of A1 and A2 and inner and outer radii r1 and r2 are maintained at t1 and t2, then rate of heat flow will be
1
\(\frac{k}{\sqrt{A_1A_2}}\frac{t_1\ -\ t_2}{r_2\ -\ r_1}\)
2
\(k\sqrt{A_1A_2}\frac{t_1\ -\ t_2}{r_2\ -\ r_1}\)
3
\(4\pi k\frac{t_1\ -\ t_2}{\sqrt{A_1A_2}}\)
4
\(4\pi kr_1r_2\frac{t_1\ -\ t_2}{\sqrt{A_1A_2}}\)