Αριθμός Ρέινολντς

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Η σήμανση τοποθετήθηκε στις 28/01/2016.

Στη μηχανική ρευστών, ο αριθμός Ρέινολντς (Re) είναι μια αδιάστατη ποσότητα, η οποία χρησιμοποιείται για να προσδιορίσουμε όμοια πρότυπα ροής σε διαφορετικές καταστάσεις ροής ρευστών. Η έννοια του αριθμού Ρέινολντς εισήχθη από τον Τζωρτζ Στόουκς το 1851, αλλά πήρε το όνομά του από τον Όσμπορν Ρέινολτς (1842–1912), ο οποίος καθιέρωσε την χρήση του το 1883.

Ο αριθμός Ρέινολντς ορίζεται ως, ο λόγος των δυνάμεων αδράνειας προς τις δυνάμεις ιξώδους και συνεπώς ποσοτικοποιεί την μεταξύ τους σημαντικότητα για μια συγκεκριμένη κατάσταση ροής. Συχνά προκύπτουν κατά τη διάρκεια πειραμάτων μοντελοποίησης, προκειμένου να προσδιορίσουμε την σχέση μεταξύ δυο διαφορετικών περιπτώσεων ροής ρευστού. Επίσης χρησιμοποιούνται για το χαρακτηρισμό του είδους μια ροής, όπως είναι η στρωτή και η τυρβώδης ροή.

  • η στρωτή ροή προκύπτει για χαμηλούς αριθμούς Ρέινολντς, όπου είναι κυρίαρχες οι δυνάμεις ιξώδους και χαρακτηρίζεται από ομαλή, σταθερή κίνηση του ρευστού.
  • η τυρβώδης ροή προκύπτει για υψηλούς αριθμούς Ρέινολντς, όπου είναι κυρίαρχες οι δυνάμεις αδράνειας, οι οποίες παράγουν χαοτικές δίνες και άλλες αστάθειες στην ροή.

Εξωτερικοί σύνδεσμοι

  • Πολυμέσα σχετικά με το θέμα Reynolds number στο Wikimedia Commons

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