بررسی اثرهای زبری سطح انتقال حرارت در جوشش استخری در محلول استون- ایزوپروپانول

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه آزاد اسلامی واحد کرمانشاه

2 دانشگاه رازی

3 دانشگاه صنعتی کرمانشاه

چکیده

در این‌پژوهش آزمایشگاهی، به بررسی اثرهای افزایش زبری سطح انتقال حرارت بر ضریب انتقال حرارت در جوشش استخری در محلول‌های دوجزئی استون و آیزوپروپانول با درصد حجمی ثابت (30% استون و 70% ایزوپروپانول و همچنین محلول 70% استون و 30% ایزوپروپانول) پرداخته شده‌است. سامانۀ آزمایشی از یک‌مکعب شیشه‌ای عایق‌بندی‌شده، یک‌استوانۀ فلزی از جنس برنز به‌عنوان سطح انتقال حرارت و یک لامپ مدادی وصل‌شده به اتوترانسفورماتور به‌عنوان منبع حرارتی تشکیل شده‌است. آزمایش­ها با چهار زبری مختلف (25/0، 34/0 ، 47/0 و 61/0 میکرومتر) سطح انتقال حرارت و گسترۀ شارهای حرارتی از 5/1 تا 88 کیلووات بر متر مربع و در شرایط هواکره‌ای انجام گرفته‌است. نتایج نشان داده‌است که با افزایش زبری سطح، تولید حباب در محلول بیشترشده و به‌دنبال آن آشفتگی افزایش یافته‌است؛ درنتیجه افزایش ضریب انتقال حرارت را به‌همراه داشته‌است. مدل بهینه با حداکثر همپوشانی با نتایج آزمایشگاهی این‌گونه مشخص گردید که در این‌میان مدل وینایاک )2004 (با خطای متوسط 15% کمترین خطا و مدل تام(1966) با خطای متوسط 27% بیشترین خطا را در میان دیگرمدل­ها دارا هستند.

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