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Experimental study was performed on heat transfer and turbulent structure of the annular flows with so-called laminarization due to channel convergence. Experimental results show that both Nusselt num...ber and turbulent intensity at the outlet of the accelerating section are appreciably lower than those in the fully turbulent region, which suggests the occurrence of the laminarization. It was also found, however, that the local value of the accelerating parameter does not have the direct influence on the heat transfer performance and also that turbulent to laminar transition process is somewhat an asymptotic one in contrast to the definite character of the usual laminar to turbulent transition. In the straight annular channel after the convergence, some intermittency and peak values of the turbulent intensity were observed, which corresponds well to the recovery process of the Nusselt number.続きを見る
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Mendeley出力
