Forced flow and convective melting heat transfer of clathrate hydrate slurry in tubes
Forced flow and convective melting heat transfer of clathrate hydrate slurry in tubes
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DOI：
10.1016/j.ijheatmasstransfer.2010.04.025
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发表时间：
2010-09-01
影响因子：
5.2
通讯作者：
Xi, G. N.
中科院分区：
文献类型：
--
作者：
Ma, Z. W.;Zhang, P.;Xi, G. N.
在这项研究中，我们提出了四丁基溴化铵（TBAB）笼形水合物浆料（CHS）流过直圆管的强制流动和对流熔融传热特性。测量了体积分数在0~20.0 vol%范围内TBAB CHS的压降，并分析了体积分数的影响。采用幂律方程描述CHS的流动行为，相应的流动行为指数和流体稠度系数等指标表明TBAB CHS为假塑性流体。基于修正的雷诺数，发现经验相关性可以用来预测TBAB CHS的流动摩擦系数。通过传热实验测量了恒定壁面热通量下 TBAB CHS 流的局部传热系数，发现固液相变中涉及的潜热增强了该系数。局部传热系数沿着加热段逐渐减小，直到体积分数小于某个小值，然后由于雷诺数的增加，在接下来的段中局部传热系数增大。讨论了加热功率、流速、体积分数对局部传热系数的影响。基于层流、过渡流和湍流区域的实验数据，分别提出了预测 TBAB CHS 传热性能的相关性。 (C) 2010 Elsevier Ltd. 保留所有权利。
In this study, we presented the forced flow and convective melting heat transfer characteristics of tetrabutylammonium bromide (TBAB) clathrate hydrate slurry (CHS) flowing through straight circular tubes. Pressure drops of TBAB CHS with the volume fraction in the range of 0-20.0 vol% were measured, and the influence of the volume fraction was analyzed. Power-law equation was used to describe the flow behavior of CHS, and the corresponding indicators including flow behavior index and fluid consistency coefficient indicated that TBAB CHS behaved as a pseudo plastic fluid. Based on the modified Reynolds number, it was found that the empirical correlation could be used to predict the flow friction factor of TBAB CHS. Heat transfer experiments were conducted to measure the local heat transfer coefficients of TBAB CHS flow under constant wall heat flux, which were found to be enhanced by the latent heat involved in the solid-liquid phase change. Local heat transfer coefficient decreased along the heating section until the volume fraction was smaller than a certain small value, then it increased in the following section due to the increase of Reynolds number. The effects of heating power, flow velocity, volume fraction on the local heat transfer coefficients were discussed. Correlations for predicting TBAB CHS heat transfer performance were proposed based on the experimental data in laminar, transitional and turbulent flow regions, respectively. (C) 2010 Elsevier Ltd. All rights reserved.