一种测定人血触变特性的新方法

A new approach to measurement of thixotropic properties of whole human blood]

With the Low Shear 30 rheometer and its accessory instruments, four torque decay curves of whole human blood from a healthy young man were recorded at shear rate 1.285, 1.747, 2.37 and 3.23 s-1 respectively for pretesting. The modified Levenberg-Marquardt non-linear parameter estimating method was used to calculate the thixotropic parameters by following Huang's equation. The results showed that the thixotropic properties of whole human blood could be measured by recording two torque decay curves. This approach is much easier than Huang's method. We have adopted it to measure the thixotropic properties of whole blood from healthy young men (n = 32) and young women (n = 32). The results were comparable to those in Huang's reports of 1976. The coefficients of variations of most parameters in our measurement were less than those in Huang's reports. Meanwhile, we analysed the advantage in using the new method and made some suggestions to improve the measurement accuracy in human blood thixotropy.