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Помогите пожалуйста! Поток воздуха под давлением р=3 бар и с температурой tж=200 С движется в трубе с диаметром d=10 мм и длиной 1м со скоростью W=8 м/с. Расчитать коэффициент теплоотдачи и плотность теплового потока на стенке, если температура поверхности трубы tст=120 С. В расчетах пренебречь зависимостью [$955$]ж и [$956$]ж от давления. Спасибо
При давлении p1 = 1,013 ∙ 105 Па и температуре tж = 200 °C коэффициент кинематической вязкости воздуха равен ν1 = 34,85 ∙ 10-6 м2/с. Поскольку давление p = 3 бар примерно в три раза превышает давление p1, то и плотность воздуха при давлении p будет примерно в три раза больше плотности при давлении p1.
Коэффициент динамической вязкости, согласно условию задачи, считаем независящим от давления. Коэффициент кинематической вязкости, как известно, равен частному от деления коэффициента динамической вязкости на плотность. Поэтому при постоянном коэффициенте динамической вязкости коэффициент кинематической вязкости ν при давлении p будет примерно в три раза меньше коэффициента кинематической вязкости при давлении p1, то есть ν ≈ ν1/3 = 34,85 ∙ 10-6/3 ≈ 11,62 ∙ 10-6 (м2/с).
Находим число Рейнольдса Re = wd/ν = 8 ∙ 0,01/(11,62 ∙ 10-6) ≈ 6880, следовательно, движение турбулентное.
В нашем случае отношение длины трубы к диаметру l/d = 1/0,01 = 100 > 50. Находим число Нуссельта: Nu- ≈ 0,018 ∙ (Re)0,8 ≈ 21 и средний коэффициент теплоотдачи: α- = Nu- ∙ λ/d = 21 ∙ 0,0393/0,01 ≈ 82,5 (Вт/(м2 ∙ К)). Тогда плотность теплового потока равна q = α- ∙ (tж – tст) = 82,5 ∙ (200 – 120) = 6600 (Вт/м2).
С уважением.
Об авторе:
Facta loquuntur.
Неизвестный
08.09.2009, 17:05
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Gerhard, извините не догадался - не ясновидец. Думал, что без соответсвующих параметров материала, окружения и многого другого (например, такие как перечислил в следующем вопросе вопрошающего) шутник именно Вы. Вузы говорите :). И раньше-то особыми знаниями могли похвастать единичные вузы. А потом приходят на производство и болта не могут расчитать. За руководство вообще молчу - 90% это дебилы! А за сейчаснотеперешнее образование вообще говорить неочем.... Вот Ваши вопросы и есть пример нынешнего образования.
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