توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A review study on modified twisted tape inserts on tubular heat exchangers
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس مبدلهای گرمایی، سال
تعداد صفحات: ۱۷
Enhancing heat transfer mechanisms are used in many industrial applications like heat exchanger, air conditioning, chemical reactors and refrigeration systems. Therefore several techniques have been promoted to enhance heat transfer rate and to decrease the size and cost of equipments especially the heat exchangers. In this present study, attempts were made to review experimental and numerical researches done in recent years to investigate the heat transfer characteristics of a heat exchanger. For the purpose of heat transfer enhancement, the configuration of heat exchangers was improved through the installation of different devices for example twisted tape inserts. The results of heat transfer show that the shell – side and tube – side heat transfer coefficient of the heat exchanger increased. But at any time the use of twisted tape inserts can be caused decisive effect on pressure drop and pumping power consumption can be increased. So that any augmentation used into the heat exchanger should be optimized among the benefits of heat transfer and the higher pumping cost rate<\div>

۲Effect of Porosity and Organocaly Level on the Ion–exchange Capacity of polyHIPE Membrane
نویسنده(ها): ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۸
Highly open–porous vinylbenzyl chloride\divinylbenzene (VBC\DVB) polyHIPE membrane containing various amounts of Cloisite30B (C30B) were synthesized successfully via polymerization of anconcentrated or high internal phase emulsion (HIPE).Amination process via using aqueous trimethylaminewas applied to obtain a functionalized porous anion–exchange nanocomposite membrane. The exchange capacity of nanocomposite membrane was determined by titration procedure. The effects of organoclay content and foam porosity have been investigated on the basis of ion exchange capacity of resultingnanocomposite membrane. The results showed that the prepared membranes possessed an ion–exchangecapacity in the range of 1.08–1.76 mequiv\g of dry membrane. Scanning electron micrographs exhibited an open–cell polyHIPE structure for all the organoclay–reinforced polyHIPE membranes. FTIR technique was also used to characterize the chemical structure of anion–exchange membrane.<\div>
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