alleryStart learning →Net radiation between a small surface at T_s and a much larger surrounding at T_sur is approximately:
A$q'' = \sigma(T_s + T_{sur})$
B$q'' = \varepsilon\sigma(T_s^4 - T_{sur}^4)$
C$q'' = h(T_s - T_{sur})$
D$q'' = k(T_s^2 - T_{sur}^2)$
Answer & Solution
Correct answer: B. $q'' = \varepsilon\sigma(T_s^4 - T_{sur}^4)$
**Surface-to-surrounding net radiation:** $\varepsilon\sigma(T_s^4 - T_{sur}^4)$.
Note BOTH temperatures appear to the FOURTH power
both must be in absolute (Kelvin) units.
Keep practising Conduction
Browse all Conduction questions for GATE ME, or explore more Mechanical Engineering topics.
Related questions
Drag each clue to its heat transfer modeThermal diffusivity α is defined as:The full 3-D unsteady heat-diffusion equation (with internal heat generation $\dot{q}$) isFor 2-D, steady-state, no-generation conduction, the governing PDE is:Fourier's law of heat conduction (1D) states:The THREE modes of heat transfer are:Heat transfer is defined as: