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If the Nusselt number (Nu) for heat transfer in a pipe varies with Reynolds number (Re) as Nu $ {\displaystyle \propto }$ Re$^{0.8}$, then for constant average velocity in the pipe, the heat transfer coefficient varies with the pipe diameter D as

  1. D$^{-1.8}$
  2. D$^{-0.2}$
  3. D$^{0.2}$
  4. D$^{1.8}$
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