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Although geometric diameter is clearly crucial in physical stability, a second look at Stoke¡¯s law in the above section reveals another means to reduce creaming. As the densities of the solids and propellant are different, the flocculated particles discussed above will be more prone to phase separation35 . Naturally, material with a density higher than that of the propellant leads to sedimentation, while the inverse yields creaming. Combinations of HFA 134a and HFA 227 may be employed at various ratios to alter the density of the continuous phase. ÎÄÖÐËùÊöµÄ´ó¸ÅÒâ˼ÊÇ£¬¸ù¾Ýstoke¹«Ê½£ºÒòΪ¹ÌÌåºÍÅ×Éä¼ÁµÄÃܶȲ»Í¬£¬ÐõÄýµÄÁ£×ÓÈÝÒײúÉúÏà·ÖÀë¡£Ò©ÎïµÄÃܶȸßÓÚÅ×Éä¼Á»á·¢Éú³Áµí£¬¶øÏà·´Ôò»á**¡£ÕâÀïCreamingµ½µ×ָʲôÒâË¼ÄØ£¬Ö»ÊÇÖ¸ÔÒ⣺È黯»¹ÊÇÖ»Ò©ÎïÁ£×Ó¸¡ÔÚÉÏÃæÄØ¡£ |
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yunyun89623
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5Â¥2013-08-08 12:16:59
andrewzhang
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2Â¥2013-08-06 16:52:53
Jimmy·½
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3Â¥2013-08-06 20:47:48
yunyun89623
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4Â¥2013-08-08 12:15:27













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