Numerous studies on flow boiling heat transfer in channels
have been performed. Various correlations have been proposed
to predict flow boiling heat transfer by Fang et al. [2], Li and Jia
[3], and Mori [4]. However, these correlations can only provide
satisfactory predictions over a finite range of flow conditions. To
satisfy the demands of engineering applications, many experiments
have been conducted to investigate smooth and rifled tubes.
According to their findings, a rifled tube significantly enhances
heat transfer, and the heat transfer coefficient (HTC) is four times
higher than that in a smooth tube [5]. In addition, heat transfer
deterioration occurs at low vapor quality in a smooth tube and is
delayed effectively by a rifled tube [6]. By contrast, this phenomenon
disappears within the vicinity of critical pressure. Iwabuchi
et al. [7] determined that heat transfer deterioration would
even occur in a subcooled region when pressure approached the
critical value. However, the mechanism of abnormal heat transfer
remains controversial, and additional studies should be conducted
to clarify this mechanism.
Numerous studies on flow boiling heat transfer in channelshave been performed. Various correlations have been proposedto predict flow boiling heat transfer by Fang et al. [2], Li and Jia[3], and Mori [4]. However, these correlations can only providesatisfactory predictions over a finite range of flow conditions. Tosatisfy the demands of engineering applications, many experimentshave been conducted to investigate smooth and rifled tubes.According to their findings, a rifled tube significantly enhancesheat transfer, and the heat transfer coefficient (HTC) is four timeshigher than that in a smooth tube [5]. In addition, heat transferdeterioration occurs at low vapor quality in a smooth tube and isdelayed effectively by a rifled tube [6]. By contrast, this phenomenondisappears within the vicinity of critical pressure. Iwabuchiet al. [7] determined that heat transfer deterioration wouldeven occur in a subcooled region when pressure approached thecritical value. However, the mechanism of abnormal heat transferremains controversial, and additional studies should be conductedto clarify this mechanism.
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