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  ______     ___      _____      ___     _    _   
 /_____//   / _ \\   / ____||   / _ \\  | |  | || 
 `____ `   / //\ \\ / //---`'  / //\ \\ | |/\| || 
 /___//   |  ___  ||\ \\___   |  ___  |||  /\  || 
 `__ `    |_||  |_|| \_____|| |_||  |_|||_// \_|| 
 /_//     `-`   `-`   `----`  `-`   `-` `-`   `-` 
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發送短信 : Wall effect on pressure drop in packed beds