An analytical and experimental study of heat transfer in fixed bed

Abstract

Heat transfer in a ®xed-bed packed with polymeric adsorbent particles, percolated by a liquid phase¯owing upward at 60°C or downward at 20°C, is experimentally studied in a column 9 cm in diameter and 1 m in length. The transient temperature pro®les were measured axially and radially in the column. Sensitivity function calculations enabled to prove that the thermal parameters could be estimated from the experimental data and also to obtain information about the optimum location of the sensors. Experimental transient temperature responses were compared to those predicted by one-dimensional (1-D) and two-dimensional ( 2-D) pseudo-homogeneous (PH) models. By ®tting the 2-D model solution to the experimental responses, values for the thermal parameter, eective radial and axial conductivities and the wall heat transfer coecient were found. Ó

A Dynamic, Adaptive, Locally Conservative, and Nonconforming Solution Strategy for Transport Phenomena in Chemical Engineering

“…Temperature profiles are presented in Figure 3 at various times, from t ¼ 0.05 to t ¼ 10. The convergence of DG solutions may be confirmed by comparing with solutions in refined discretizations and with published solutions in the literature (Coimbra et al, 2004;Ferreira et al, 2002). It is easy to see that the enthalpy (heat energy) is transferred into the bed mainly by convection at the entrance of the bed and is transferred away from the bed by both the conduction through the wall and the convection at the bed exit.…”

“…In particular, simulations of this process are crucial to the analysis and design of separation units in which a fluid passing through the bed exchanges mass and heat with the particles in the presence of chemical reactions (e.g., exothermic catalytic reaction) or in the absence of chemical reactions (e.g., non-isothermal adsorption). We now consider a two-dimensional pseudo-homogeneous model described by the following governing dimensionless equation (e.g., Smith, 1956;Ferreira et al, 2002):…”

Numerical Study on Heat Transfer Performance in Packed Bed

“…There are no standard empirical correlations which can be applied to all the range of tube-to-particle ratios. So, various effective parameters under steady state are proposed, including effective thermal conductivities [12], overall heat transfer coefficient, and effective transport parameters [13][14][15]. Recently, with the development of computer technology, the Computational Fluid Dynamics (CFD) method is adopted to save the time and economic cost.…”

Method of thermal calculation of a heat exchanger with a dense layer of granulated material

“…Рекуперативные теплообменники с плотным слоем дисперсных (гранулированных) материалов характеризуются высокой тепловой эффективностью, компактностью, небольшой массой, простотой конструкции, надежностью [12][13][14]. Использование гранулированных материалов в теплоэнергетике позволяет интенсифицировать процессы тепло-и массообмена [15][16][17] ІІІ. Выполнить расчет по следующему алгоритму:…”