Q5Electrical Machine Design
Question
Q.5. The heat dissipation by air blast belongs to which of the one category such as conduction, convection, or radiation.
Answer
Heat dissipation by air blast (forced air cooling) belongs to the convection category, specifically forced convection.
Heat dissipation by air blast is a form of convection heat transfer, specifically forced convection, in which a fan or blower actively moves air across the heated surface (windings, core, or cooling fins) to carry away heat, as opposed to natural (free) convection where air movement occurs only due to buoyancy-driven density differences. Forced convection via air blast achieves a significantly higher heat transfer coefficient than natural convection, allowing more compact machine designs for a given loss and permissible temperature rise.