Numerical Study on Flow and Heat Transfer Characteristics with Low-Reynolds Number in Micro-Wavy Tubes

The flow and heat transfer characteristics of three different micro-wavy tubes with different configuration parameters（the curve radius is 32 mm,and the curve angles are 45°,60° and 75°,respectively） in low-velocity（0.0033m/s≤u≤0.05m/s） flow are considered,using software Fluent for computing fluid dynamics.The results show that the curve angle plays an important role in the flow and heat transfer characteristics of micro-wavy tubes.The Nu numbers and friction coefficients f are much larger compared with that of straight tube with the same diameter,f increases when the amplitude ^A becomes larger and the ratio of μplays a decisive role in Nu numbers.When 20≤Re≤300,the Nu number and the friction coefficient f are in-creased by as much as 166.3% and 52.6%,respectively.