External Coefficient of Heat Transfer by Convection in Mixed Vessels Using Vertical Tube Baffles

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• 作者：Vitor da Silva Rosa ; Thiago Cesar de Souza Pinto ; Aldo Ramos Santos ; Carlos Alberto Amaral Moino ; Karina Tami茫o ; Luiz Renato Bastos Lia ; Elias Basile Tambourgi ; Marc铆lio Dias Lopes ; Juliana T贸fano de Campos Leite Toneli ; Deovaldo de Mores J煤nior
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：52
• 期：6
• 页码：2434-2438
• 全文大小：284K
• 年卷期：v.52,no.6(February 13, 2013)
• ISSN：1520-5045

文摘

Many correlations in the literature have been proposed to predict the external heat transfer coefficient, but most of them are suggested for batch operations. This paper aims to experimentally investigate a steady state condition (usually found in industrial processes) of mixed vessels equipped with a four 45掳 pitched-blade turbine and vertical tubular baffles to determine the external heat transfer coefficient. An empirical correlation based on the work of Sieder鈥揟ate [Ind. Eng. Chem.1936, 1429鈥?435] for a steady state condition using standard configuration of a mixing system is being proposed. A sucrose solution of 20% and 32% concentrations (w/w) and a mixing apparatus with a 50 L cylindrical flat bottom vessel are employed. Water was used as heating fluid running inside the vertical tubular baffles with an inlet temperature range from 25 to 45 掳C and an impeller speed from 30 to 330 rpm. A new fit correlation was proposed based on the Sieder鈥揟ate modeling, yielding good agreement with experimental data in steady states with deviations of less than 15% between observed and predicted external heat coefficients.