A RHEOLOGICAL STUDY OF RHINORRHEA
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概要
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Clinically, rhinorrhea presents itself as one of the main symptoms of diseases of the paranasal sinuses and is an important clue in establishing diagnosis and in deciding on the treatment.<BR>Although rhinorrhea has long been studied from various viewpoints, there are very few papers describing the results of rheological studies on it including its detailed physical characteristics.<BR>We have performed a rheological study on 30 specimens of rhinorrhea utilizing cone-plate viscometer, which has been reported to be the most accurate method to detemine physical properties of non-newtonian fluid such as rhinorrhea. The results were as follows:<BR>1) Rhinorrhea is non-newtonian fluid with apparent viscosity depending on shear rate. It gave thixotropy phenomenon and had pseudo-plastic and structural viscosity. Its viscosity curve and fluidity curve formed a hysteresis loop.<BR>2) When comparing our date of rhinorrea with those of sputum reported by Akagami, shear stress, which corresponds to shear rate of each specimen, was higher for rhinorrhea than for sputum.<BR>3) Rhinorrhea was found to have a mean value of about 53 dyn/cm2 by Cone's Ascending Order as studied in 30 specimens in this study.
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