Oil-air two-phase flow measurement was investigated with a Venturi and void fraction meters in this work. This paper proposes a new flow rate measurement correlation in which the effect of the velocity ratio between g...Oil-air two-phase flow measurement was investigated with a Venturi and void fraction meters in this work. This paper proposes a new flow rate measurement correlation in which the effect of the velocity ratio between gas and liquid was considered. With the pressure drop across the Venturi and the void fraction that was measured by electrical capacitance tomography apparatus, both mixture flow rate and oil flow rate could be obtained by the correlation. Experiments included bubble-, slug-, wave and annular flow with the void fraction ranging from 15% to 83%, the oil flow rate ranging from 0.97 kg/s to 1.78 kg/s, the gas flow rate ranging up to 0.018 kg/s and quality ranging nearly up to 2.0%. The root-mean-square errors of mixture mass flow rate and that of oil mass flow rate were less than 5%. Furthermore, coefficients of the correlation were modified based on flow regimes, with the results showing reduced root-mean-square errors.展开更多
目的评价3D MIA DICOM数据分析软件对心腔容积定量评估的准确性。材料与方法对10个新鲜猪心和10例经心脏超声检查后的住院患者行64排螺旋CT心脏扫描,采用3D MIA DICOM数据分析软件分析并测量猪心的右心室容积和患者左室心腔容积,分析3D ...目的评价3D MIA DICOM数据分析软件对心腔容积定量评估的准确性。材料与方法对10个新鲜猪心和10例经心脏超声检查后的住院患者行64排螺旋CT心脏扫描,采用3D MIA DICOM数据分析软件分析并测量猪心的右心室容积和患者左室心腔容积,分析3D MIA DICOM数据分析软件测量值与猪心实际容积和人体心脏超声测量值之间的相关性。结果3D MIA DICOM软件所测猪心的右室容积和人体心脏舒张末期左室容积与物理测量值及心脏超声测量值之间具有很好的相关性(r1=0.94,r2=0.97),Altman and Bland一致性分析表明二者具有高度的一致性。结论3D MIA DICOM数据分析软件为定量分析心腔容积提供了一种无创、简单可行且准确可信的新方法。展开更多
基金Project (No. 2001AA413210) supported by the Hi-Tech Researchand Development Program (863) of China
文摘Oil-air two-phase flow measurement was investigated with a Venturi and void fraction meters in this work. This paper proposes a new flow rate measurement correlation in which the effect of the velocity ratio between gas and liquid was considered. With the pressure drop across the Venturi and the void fraction that was measured by electrical capacitance tomography apparatus, both mixture flow rate and oil flow rate could be obtained by the correlation. Experiments included bubble-, slug-, wave and annular flow with the void fraction ranging from 15% to 83%, the oil flow rate ranging from 0.97 kg/s to 1.78 kg/s, the gas flow rate ranging up to 0.018 kg/s and quality ranging nearly up to 2.0%. The root-mean-square errors of mixture mass flow rate and that of oil mass flow rate were less than 5%. Furthermore, coefficients of the correlation were modified based on flow regimes, with the results showing reduced root-mean-square errors.
文摘目的评价3D MIA DICOM数据分析软件对心腔容积定量评估的准确性。材料与方法对10个新鲜猪心和10例经心脏超声检查后的住院患者行64排螺旋CT心脏扫描,采用3D MIA DICOM数据分析软件分析并测量猪心的右心室容积和患者左室心腔容积,分析3D MIA DICOM数据分析软件测量值与猪心实际容积和人体心脏超声测量值之间的相关性。结果3D MIA DICOM软件所测猪心的右室容积和人体心脏舒张末期左室容积与物理测量值及心脏超声测量值之间具有很好的相关性(r1=0.94,r2=0.97),Altman and Bland一致性分析表明二者具有高度的一致性。结论3D MIA DICOM数据分析软件为定量分析心腔容积提供了一种无创、简单可行且准确可信的新方法。
