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     EduGorilla 
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    Two liquids (P and Q) having same viscosity are flowing through a double pipe heat exchanger as shown in the schematic below.

    Densities of P and Q are 1000 kg/m3 and 800 kg/m3 respectively. The average velocities of the liquids P and Q are 1 m/s and 2.5 m/s respectively. The inner diameters of the pipes are 0.31 m and 0.1 m. Both pipes are 5 mm thick. The ratio of the Reynokis numbers ReP to ReQ is

    Options :-

    1. 2.5
    2. 1.55
    3. 1
    4. 4
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