Natural convection may help or hurt forced convection heat transfer, depending on the relative directions of buoyancy-induced and the forced convection motions three special cases that have been studied extensively correspond to buoyancy-induced and forced motions:. Heat transfer by forced convection generally makes use of a fan, blower, or pump to provide high- velocity fluid (gas or liquid) the high-velocity fluid results in a decreased thermal resistance across. The essential ingredients of forced convection heat transfer analysis are given by newton's law of cooling, the rate of heat transfered to the surrounding fluid is proportional to the object's exposed area a, and the difference between the object temperature t w and the fluid free-stream temperature.
In both cases, forced ornatural convection, an analytical determination ofthe convection heat transfer coefficient he' requires the knowledge of temperature distribution in the fluid flowing on the heated surface. In forced convection, air or water is forcibly moved across the body surface (such as in wind or wind-generated water currents) and efficiently removes heat from the body convection is a very efficient way of heat transfer because it maintains a steep temperature gradient between the body and surrounding air or water.
Part b: heat transfer principals in electronics cooling mpe 635: electronics cooling 54 8 forced convection heat transfer 81 introduction the general definition for convection may be summarized to this definition energy transfer between. The flow may give rise to convective heat transfer where it is driven by a pump and is referred to as forced convection, or arise as a consequence of temperature gradients and buoyancy, referred to as natural or free convection.
H is the convective heat transfer coefficient in btu/hr-ft 2-o f (w/m 2-k for si) the biggest part of forced convection heat transfer calculations is determination of a value for the convective heat transfer coefficient, h, for the heat transfer configuration of interest.
Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids convection is usually the dominant form of heat transfer in liquids and gases. Convective heat transfer , often referred to simply as convection , is the transfer of heat from one place to another by the movement of fluids convection is usually the dominant form of heat transfer in liquids and gases the term forced convection is used if this motion and mixing is caused by an outside force, such as a pump. 41 page 42 4 forced convection heat transfer in chapter 3, we have discussed the problems ofheat conduction and used the convection as one ofthe boundaryconditions that can beapplied to the surface ofa conducting solid.