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**Frequently Asked Questions and Problems for Practice**

Q.1 | What is the local Reynolds number? |

Q.2 | What are the important dimensionless groups in heat transfer? Explain their physical significance. |

Q.3 | What is the difference between Reynolds and Prandtl anologies? |

Q.4 | Explain why there is more heat transfer in forced convection as compared to natural convection. |

Q.5 | What is Dittus-Boelter equation and when is it applied? |

Q.6 | Water is to be heated from 50^{o}C to 100^{o}C in a smooth hot pipe. The pipe is maintained at a constant temperature above 30^{o}C that of bulk water temperature under the condition of constant heat flux. Calculate the length of the pipe required for heating, if the tube diameter is 0.6 m and the Reynolds number of the water inside the pipe is 95000? |

Q.7 | A tube bank having a square array of 100 tubes arranged in an in-line position is at 100 |

Q.8 | Water at 15 |

Q.9 | Atmospheric air flows at 10 m/s of free stream velocity in a rectangular duct having dimensions of 25 cm by 50 cm. The air and wall temperature of the duct are 25 ^{o}C and 50 ^{o}C, respectively. Calculate the mean exit temperature of the air per unit length of the duct. |

Q.10 | Air at 25 ^{o}C flows in a 10 mm diameter tube at a Reynolds number of 50,000. If the length of the tube is 100 cm, estimate the average heat transfer coefficient for a constant heat flux at the wall. |

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