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Numerical simulation of paper drying process under infrared radiation emitter

BHAGAT, KISHNA NAND

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2008, MS, University of Cincinnati, Engineering : Mechanical Engineering.
Paper drying process using infrared radiation emitter is simulated numerically in order to study the influence of process parameters and thermo-physical properties on paper drying rate. A finite volume method based formulation was developed to capture the complex drying phenomena that include simultaneous heat and mass transfer, phase change process, and a moving drying front. The source of energy for drying in this case was radiation from the infrared emitters. The radiation heat flux is dependent upon the emissivity of the infrared emitter. In the first part of this thesis, a unique technique is developed for determining emissivity of radiation emitter. The emissivity values are calculated by comparing temperature measurements with numerically predicted temperature distribution results. In the second part of this thesis, numerical simulation of the paper drying process has been carried out. The paper drying process involved three modes of heat transfer (conduction, convection and radiation heat transfer), as well as evaporation of water into vapor, liquid water migration inside the paper due to capillary effects and diffusion of water vapor and air inside paper and at the paper surface. The governing equations are species mass conservation, momentum and energy conservation with an equation to track the drying front. The governing equations are second order, unsteady, coupled, non-linear, partial differential equations. The central differencing scheme is used for spatial derivatives and a backward differencing scheme is used for temporal derivatives. Boundary conditions are discretized by integrating over half control volume near the boundary. For non-linear terms, quasi linearization is used. The numerical scheme used here is implicit, one dimensional in space and propagates forward in time. Two characteristic variables to denote progress in drying namely, liquid water density and temperature, are calculated at every grid point with progress in time. A parametric study is carried out to understand the influences of permeability of water in paper, thermal conductivity of paper, density of paper fiber, paper porosity, paper thickness, radiation absorption coefficient of paper and water, diffusivity of vapor in paper, convection heat transfer coefficient, air temperature, vapor fraction in air and initial moisture content in paper over paper drying rate. The results are presented in terms of temporal variations of temperature and moisture distributions at the top layer, at the middle layer and average over the paper thickness.
Dr. Milind Jog (Advisor)
103 p.

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Citations

  • BHAGAT, K. N. (2008). Numerical simulation of paper drying process under infrared radiation emitter [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204220932

    APA Style (7th edition)

  • BHAGAT, KISHNA. Numerical simulation of paper drying process under infrared radiation emitter. 2008. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204220932.

    MLA Style (8th edition)

  • BHAGAT, KISHNA. "Numerical simulation of paper drying process under infrared radiation emitter." Master's thesis, University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204220932

    Chicago Manual of Style (17th edition)