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An analog experiment of magma fragmentation: behavior of rapidly decompressed starch sirup

机译：岩浆破碎的模拟实验：快速减压淀粉浆的行为

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Paper reports a result of analog experiments regarding the simulation of magma fragmentation. We filled a starch sirup foam, as an analog material, in a 117–240 mm long and a 50 mm diameter high pressure chamber and exposed it to a rapid decompression. The foam was prepared by mixing starch sirups of dynamic viscosities ranging from 5 to 1012 Pa· s at temperatures ranging from 293 to 343 K with nitrogen at 2.5 MPa gauge pressure. In ejecting high-pressure foams into a low-pressure chamber, diagnostics of foam’s fragmentation process were pressure measurment and high-speed video recording. Prior to decompression experiments, we examined visco-elastic properties of foam specimens by using a rheometer. The foam deformation under decompression was found to be axial–symmetrical, and strongly coupled with bubble growth and coalescence. These effects contributed even more efficiently to fragmentation processes than previous laboratory experiments using other analog materials. Fragment shapes varied widely depending on the temperature and water concentration of starch sirup foams, which proved that fragmentation process was governed by not only ductile deformation but also brittle failure, and determined by the degree of visco-elasticities of starch sirup foams.
机译：论文报告了关于岩浆破碎模拟的模拟实验结果。我们在117-240毫米长，直径50毫米的高压腔中填充了淀粉糖浆泡沫（作为模拟材料），并将其暴露于快速减压下。通过将动态粘度范围为5至1012 Pa·s的淀粉浆在293至343 K的温度下与氮气在2.5 MPa的表压下混合来制备泡沫。在将高压泡沫喷射到低压腔中时，泡沫破裂过程的诊断是压力测量和高速视频记录。在进行减压实验之前，我们使用流变仪检查了泡沫样品的粘弹性。发现减压下的泡沫变形是轴对称的，并且与气泡的生长和聚结紧密相关。与以前使用其他类似材料进行的实验室实验相比，这些效应对裂解过程的贡献更高。碎片形状的变化取决于淀粉糖浆泡沫的温度和水浓度，这证明碎裂过程不仅受韧性变形的控制，而且还受脆性破坏的影响，并且由淀粉糖浆泡沫的粘弹性程度决定。

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