دراسة تجريبية للانتشار الحراري المضطرب قرب جدار مجرى هواء
Abstract
يلعب الانتشار الحراري المضطرب دوراً أساسياً في النقل الحراري. إن نظرية تايلور الإحصائية تعطي صورة واضحة للظاهرة من أجل تدفق متجانس وموحد.
لقد بيّنا أن الانتشار كان بإمكانه أن يطبق من أجل اتجاه موازٍ لسرعات متساوية لجريان مستوٍ.
نقدم هنا النتائج التجريبية التي تخص الانتشار الطبيعي لسرعات متساوية في منطقة قريبة جداً من الجدار ( ). حصلنا على هذه النتائج من خلال تجارب قمنا بها, وقد أعطت نتائجها بعض المعلومات عن الانتشار الحراري في تلك المنطقة.
La diffusion thermique turbulente joue un rôle essentiel dans les transferts thermique. La théorie statistique de Taylor donne une image claire du phénomène pour un écoulement homogène et isotrope.
Nous avons montré qu’elle pouvait encore s’appliquer pour la direction parallèle aux isovitosses d’un écoulement.
Nous présentons ici des résultats expérimentaux concernant la diffusion normale aux isovitosses dans la région très près de la paroi . Ils ont été obtenus au cours des expériences qui se continuent actuellement et, bien que partiels, ils donnent quelques précisions sur la diffusion dans cette zone.
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