Rheological study of an hydrate slurry for air conditionning application
Rheological study of an hydrate slurry for air conditionning application
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发表时间：
2005-06
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通讯作者：
M. Darbouret;M. Cournil;J. Herri
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作者：
M. Darbouret;M. Cournil;J. Herri
在大气压条件和0°C至+12°C之间的温度下，四正丁基溴化铵（TBAB）水溶液结晶成水合物浆料。这些浆料似乎非常适合于空调应用中的冷藏和运输。我们在这里集中在TBAB水合物浆料的结晶和流变性能。一旦描述的结晶条件，我们提出了一个实验分析其流动行为。该实验装置由刷式换热器和测量回路组成，在刷式换热器中生成水合物浆液。通过流速和压降测量来表征浆料的流动行为。得到了水合物浆液的流动曲线随水合物固体颗粒体积分数的变化规律。在所研究的剪切速率范围内，水合物浆表现为宾汉流体。我们提出了一种方法来确定它们的表观粘度和屈服剪切应力与水合物的体积分数。
Under atmospheric pressure condition and tempertures between 0°C and +12°C, Tetra-n-ButylAmmonium bromide (TBAB) aqueous solutions crystallise into hydrate slurries. These slurries seem to be well appropriate for cold storage and transportation in the case of air-conditionning applications. We focus here on the crystallisation and the rheological properties of TBAB hydrates slurries. Once the crystallisation conditions described, we propose an experimental analysis of their flow behaviour. The experimental device is made up of a brushed surface heat exchanger in which the hydrates slurry is generated, and of a mesasurement loop. The flow behaviour of the slurry is characterised through flow rates and pressure drops measurements. We obtain flow curves of hydrates slurries depending on the volume fraction of hydrate solid particles. In the range of shear rate investigated, hydrate slurries behave as Bingham fluids. We propose a method of determining their apparent viscosities and yield shear stress versus the volume fraction hydrates.