Axial Heat Conduction

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Bernhard Weigand - One of the best experts on this subject based on the ideXlab platform.

Satoru Momoki - One of the best experts on this subject based on the ideXlab platform.

Benjamin A Wilhite - One of the best experts on this subject based on the ideXlab platform.

  • analysis of solid phase Axial Heat Conduction upon hot spot formation in a one dimensional microreactor
    Chemical Engineering Journal, 2019
    Co-Authors: Sunjeev Venkateswaran, Costas Kravaris, Benjamin A Wilhite
    Abstract:

    Abstract A generalized one-dimensional model of a non-isothermal, monolithic microreactor is developed to investigate the impact of solid-phase Axial Heat Conduction upon hot-spot formation. The model consists of a pair of first-order differential equations describing an exothermic reacting fluid which exchanges Heat with the solid-phase that comprises the monolithic microreactor. Solid-phase Axial Heat Conduction and exchange with an isothermal coolant is described by an additional second-order ordinary differential equation, with boundary conditions accounting for the possibility of conductive Heat losses to adjacent fluid distribution manifolds. Criticality analysis is performed using both the explicit Van Welsenaure and Froment (VWF) criteria and implicit Morbidelli and Varma (MV) criteria. Results indicate that the VWF criteria applied to the limiting case of negligible Axial Heat Conduction provides a reliable, albeit conservative, criteria for hot-spot prevention. Additionally, MV criteria applied to the case of sufficiently high Axial Heat Conduction yields criteria for ensuring hot-spot formation. Analysis using MV criteria indicates that the introduction of mild solid-phase Axial Heat Conduction promotes hot-spot formation so long as Heat losses to manifolds is minimal.

  • parametric study of solid phase Axial Heat Conduction in thermally integrated microchannel networks
    Industrial & Engineering Chemistry Research, 2008
    Co-Authors: Angela M Moreno, Kevin Murphy, Benjamin A Wilhite
    Abstract:

    A parametric study is presented to highlight design challenges of thermally integrated microchannel networks for portable chemistry and/or fuels reforming. One-dimensional modeling analysis of Heat transfer in a two-fluid system is presented for the case of (i) two nonreacting fluids (Heat exchanger), (ii) a single exothermic reacting fluid and a second nonreacting fluid (regenerative combustor), and (iii) one exothermic reacting fluid and a second endothermic reacting fluid (Heat exchanger reactor). In each case, the influence of solid-phase thermal conductivity and thermal packaging upon thermal efficiency, reaction conversion, and steady-state multiplicity is investigated. Results demonstrate the importance of both packaging and solid-phase Axial thermal Conduction upon system performance, with optimal performance obtained using low thermal conductivity substrates. Modeling analysis predicts steady-state multiplicity when employing low thermal conductivity materials, illustrating the need for future de...

Odgerel Jambal - One of the best experts on this subject based on the ideXlab platform.

Toru Shigechi - One of the best experts on this subject based on the ideXlab platform.