Thermal transport in two-phase gas—solid suspension flow through packed beds
TL;DR: In this article, a method to evaluate the overall Nusselt numbers for heat transfer rates in a packed bed with gas-solid suspension flow through it is presented, including separation of the overall heat transfer coefficient into conduction, convection and radiation contributions and their interactions.
About: This article is published in Powder Technology.The article was published on 1990-07-01. It has received 12 citations till now. The article focuses on the topics: Heat transfer coefficient & Kozeny–Carman equation.
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TL;DR: In this article, the published heat transfer data obtained from steady and nonsteady measurements are corrected for the axial fluid thermal dispersion coefficient values proposed by Wakao and Funazkri.
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TL;DR: G, = noise generator k = integral value of B/T K, = controller gain K, = process gain n, = Laplace transform variable s, = coefficients of the polynomial 6(B) (denominator of G,(B)) t = time T = sampling interval X, (B) = transfer function of forward loop controller.
Abstract: G, = noise generator k = integral value of B/T K , = controller gain K , = process gain n, = noise sequence s = Laplace transform variable s, = coefficients of the polynomial 6(B) (denominator of G,(B)) t = time T = sampling interval X,(B) = transfer function of forward loop controller (Table 111) y = system output ut = controller signal a = relative perturbation in process parameters = relative perturbation in process time delay r ( B ) = polynomial resulting from factorization (Appendix) y, = coefficients of y ( B ) 6(B) = denominator of G,(B)
53 citations
TL;DR: In this paper, the results of various experiments on heat transfer are presented, including the correlations of heat transfer data and the discussion of correlating parameters that are based on the theoretical models of the energy transfer process.
Abstract: Publisher Summary The rate of heat transfer to the suspension depends on the fluid dynamic properties of the flow and the transport processes are governed by complicated interactions between: (1) fluid and particle, (2) particle and particle, and (3) the mixture and the flow boundary. Local mean fluid dynamic properties that control the energy and the momentum transport includes particle velocity, gas velocity, and local particle flux. This chapter presents the results of various experiments on heat transfer. The discussion includes the correlations of heat transfer data and the discussion of correlating parameters that are based on the theoretical models of the energy transfer process. The fluid dynamic properties of the suspension flow system are fundamental to the heat transfer process, and any advances in understanding and analysis of the thermal system must be based on the progress in the description of the isothermal system. Therefore, the chapter also presents information that is based on experiments on the point mean properties of the isothermal flow of a suspension of glass spheres in air. A universal velocity law for the suspension as a continuum is derived from the fundamental equations and the constants for the law are derived from the experimental observations. Values of the eddy diffusivity for momentum are also derived from the data and presented.
51 citations