milk product manufacturer operating at a capacity of 1200 L/h heats the drink to 75 °C for pasteurization. The heated milk, after exiting the heating section of the pasteurization system, enters a stainless steel holder. If a holder with a diameter of 5 cm is used, then the minimum required length for adequate pasteurization is 10.2 m. Determine the minimum required length if a holder with a diameter of 2.5 cm is to be used. P (75 °C) = 975 kg/m u (75 °C) = 4 mPa.s