先进材料疑固实验室 Heat transfer Laboratory of Advanced Materials Solidification Newton's cooling law in convection is a restatement of the differential equation given by Fourier's law: =h·ATe-Tm)=~A△T阳 dt Where O is the thermal energy in joules h is the heat transfer coefficient(assumed independent of T here)(W/(m2 K)) 4 is the heat transfer surface area(m2) Tt)is the temperature of the object's surface and interior(since these are the same in this approximation) T is the temperature of the environment;i.e.the temperature suitably far from the surface T()=T()-Tm is the time-dependent thermal gradient between environment and object 熟 上海充通大￥ SHANGHAI JIAO TONG UNIVERSITYHeat transfer Newton's cooling law in convection is a restatement of the differential equation given by Fourier's law: Where Q is the thermal energy in joules h is the heat transfer coefficient (assumed independent of T here) (W/(m2 K)) A is the heat transfer surface area (m2) T(t) is the temperature of the object's surface and interior (since these are the same in this approximation) Tenv is the temperature of the environment; i.e. the temperature suitably far from the surface ΔT(t)=T(t)−Tenv is the time-dependent thermal gradient between environment and object