Calculate the time ⏱️ it will take for cooling down a cup of hot milk   😙  💨 ☕️ 

How can I calculate the time ⏱️ it will take for me to cool down a cup of hot milk ☕️ by blowing over it 😙💨?


  • Hi

    The process of cooling by blowing over something is called Forced convection. The rate of heat transfer can be computed using the Newton's law of cooling - which states that the convection heat transfer rate, q", is directly proportional to the difference between the surface and fluid temperatures. In mathematical terms,

    q" = h(T_s - T_inf)


    q" - convection heat flux (W/m^2),

    h - proportionality constant referred to as the heat transfer coefficient (W/(m^2.K)),

    T_s - surface temperature, and

    T_inf - bulk fluid temperature.

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