Say we have two hot objects of the same material but of different width and same thickness.
The objects are moving horizontally, have initially the same temperature and are cooled by a gas blown from jets placed above and below them to reduce their temperature. The position of jets is fixed and they are directed normal to the surface of the objects. Their speeds are 0.58 m/sec and 1.85 m/sec.
Each object will look this way and it will have jets below and above it
What is the effect of volumetric flow rate of each object on convection and radiation heat fluxes? Each object is moving with a different velocity, and have different dimensions so one of them will have a minimum volumetric flow rate and another will have a maximum volumetric flow rate.
I will mention some definitions:
Volumetric flow rate is a term in physics that describes how much matter – in terms of physical dimensions, not mass – moves through space per a unit of time. It is calculated this way: Q = V*A , where Q is the volumetric flow rate, V is the flow velocity and A is the cross sectional area.
Heat transfer for Convection is q = hAdT , where q is the heat transfer, h is the convective coefficient, A is the area of the object surface, and dT is the difference in temperature between the object and its surrounding environment.
Heat transfer for Radiation is q = ƐσΑ*(T^4 - Tc^4) , where Ɛ is the emisivity, σ is stefan's constant, A is the area, T is temperature of object, and Tc is temperature of surroundings.