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Консультация № 198351
23.04.2020, 14:01
0.00 руб.
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Здравствуйте! У меня возникли сложности с таким вопросом:. Для определения относительной вязкости крови можно использовать вискозиметр Оствальда. Обоснуйте возможность определения вязкости крови по формуле = t / t0 , где t - время протекания крови между калибровочными отметками вискозиметра; t0 - время протекания воды через тот же объем.
Обсуждение
24.04.2020, 11:28
общий
это ответ
Здравствуйте, evdokya97!
Принцип действия капиллярного вискозиметр основан на том, что сопротивление жидкости прямо пропорционально скорости её течения и вязкости, поэтому скорость будет обратно пропорциональна, а время вытекания прямо пропорционально вязкости.
Здесь нужно отметить, что приводящее жидкость в движение давление столба этой жидкости, а также эффективная площадь соприкосновения жидкости со стенками прибора меняются по мере вытекания жидкости, что очевидно приводит к несколько непостоянной скорости течения, однако их профиль по отношению ко времени вытекания практически постоянен для конкретного прибора, поэтому время вытекания остаётся прямо пропорционально вязкости.
Ещё один важный фактор - давление столба жидкости прямо пропорционально плотности, поэтому в общем случае нужно также вводить поправку на отношение плотностей жидкостей однако, кровь в основном состоит из воды, и её плотность мало отличается от плотности воды, поэтому допустимо не вносить эту поправку и ограничиться отношением времени вытекания жидкостей.
Принцип действия капиллярного вискозиметр основан на том, что сопротивление жидкости прямо пропорционально скорости её течения и вязкости, поэтому скорость будет обратно пропорциональна, а время вытекания прямо пропорционально вязкости.
Здесь нужно отметить, что приводящее жидкость в движение давление столба этой жидкости, а также эффективная площадь соприкосновения жидкости со стенками прибора меняются по мере вытекания жидкости, что очевидно приводит к несколько непостоянной скорости течения, однако их профиль по отношению ко времени вытекания практически постоянен для конкретного прибора, поэтому время вытекания остаётся прямо пропорционально вязкости.
Ещё один важный фактор - давление столба жидкости прямо пропорционально плотности, поэтому в общем случае нужно также вводить поправку на отношение плотностей жидкостей однако, кровь в основном состоит из воды, и её плотность мало отличается от плотности воды, поэтому допустимо не вносить эту поправку и ограничиться отношением времени вытекания жидкостей.
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