Numerical calculation on flow and heat transfer rule in corrugated tube

Flow and heat transfer performance inside the corrugated tube were numerically simulated by use of three dimensional laminar and low Reynolds Number turbulent model. The simulated results agree well with the experimental results. The parameter range of the flow and heat transfer correlation for corrugated tube was widened through numerical calculation. It is found that the variation tendency of resistance coefficient with Reynolds Number for the corrugated tube follows the exponential law in a large Reynolds Number range. Effects of different ripple height and ripple spacing on flow and heat transfer were investigated, and comprehensive evaluation was made for the performance of the model parameters. Results show that the effects of ripple height on flow and heat transfer inside the corrugated tube is more obvious than that of ripple spacing. The strengthened heat transfer performance of corrugated tube can be realized only under high Reynolds Number. The comprehensive performance factor for the corrugated tube increases with the Reynolds Number. The optimum structural parameters and optimum Reynolds Number range for flow and heat transfer inside the corrugated tube were obtained through numerical calculation.