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Numerical Heat Transfer And Fluid Flow

A conceptualized impeller called KIA is designed for impact agitation of food waste in a homogenizer. A comparative analysis of the performance of KIA is made with three conventional impeller types, Rushton, Anchor, and Pitched Blade. Solid–liquid mixing of a moisture-rich food waste is simulated under various operational speeds, in order to compare the dispersions and thermal distributions at homogenous slurry conditions. Using SolidWorks, the design of the impellers employs an Application Programming Interface (API) which acts as the canvas for creating a graphical user interface (GUI )for automation of its assembly. A parametric analysis of the homogenizer, at varying operational speeds, enables the estimation of the critical speed of the mixing shaft diameter and the deflection under numerous mixing conditions and impeller configurations. The numerical simulation of the moisture-rich food waste (approximated as a Newtonian carrot–orange soup) is performed with ANSYS CFX v.15.0. The velocity and temperature field distribution of the homogenizer for various impeller rotational speeds are analyzed. It is anticipated that the developed model will help in the selection of a suitable impeller for efficient mixing of food waste in the homogenizer.

Design of Stirrer Impeller with Variable Operational Speed for a Food Waste Homogenizer

A biofuel from any biodegradable formation process such as a food waste bio-digester plant is a mixture of several
gases such as methane (CH4), carbon dioxide (CO2), hydrogen sulfide (H2S), ammonia (NH3) and impurities like
water and dust particles. The results are reported of a parametric study of the process of separation of methane,
which is the most important gas in the mixture and usable as a biofuel, from particles and H2S. A cyclone, which
is a conventional, economic and simple device for gas-solid separation, is considered based on the modification of
three Texas A&M cyclone designs (1D2D, 2D2D and 1D3D) by the inclusion of an air inlet tube. A parametric
sizing is performed of the cyclone for biogas purification, accounting for the separation of hydrogen sulfide (H2S)
and dust particles from the biofuel. The stochiometric oxidation of H2S to form elemental sulphur is considered a
useful cyclone design criterion. The proposed design includes geometric parameters and several criteria for
quantifying the performance of cyclone separators such as the Lapple Model for minimum particle diameter
collected, collection efficiency and pressure drop. For biogas volumetric flow rates between 0 and 1 m/s and inlet
flow velocities of 12 m/s, 15 m/s and 18 m/s for the 1D2D, 2D2D and 1D3D cyclones, respectively, it is observed
that the 2D2D configuration is most economic in terms of sizing (total height and diameter of cyclone). The 1D2D
configuration experiences the lowest pressure drop. A design algorithm coupled with a user-friendly graphics
interface is developed on the MATLAB platform, providing a tool for sizing and designing suitable cyclones.

/pdf/performance-characterization-of-gas-solid-cyclone-for-11xktw4lcj.pdf

Performance Characterization of Gas-Solid Cyclone for Separation of Particle from Syngas Produced from Food Waste Gasifier Plant

The Influence of Sludge on Thermal Performance of Heat Exchanger Tubes Inside in an Anaerobic Digester

Design of an agitator in the anaerobic digester for mixing of biomass slurry

Numerical simulation of a suspended stirrer within a homogenizing system is performed towards determining the mixing performance of a homogenizer. A two-dimensional finite volume formulation is developed for the cylindrical system that is used for the storage and stirring of biodegradable food waste from eatery centers. The numerical solver incorporates an analysis of the property distribution for viscous food waste in a storage tank, while coupling the impact of mixing on the slurry fluid. Partial differential equations, which describe the conservation of mass, momentum and energy, are applied. The simulation covers the mixing and heating cycles of the slurry. Using carrot-orange soup as the operating fluid (and its thermofluid properties) and assuming constant density and temperature-dependent viscosity, the velocity and temperature field distribution under the influence of the mixing source term are analyzed. A parametric assessment of the velocity and temperature fields is performed, and the results are expected to play a significant role in designing a homogenizer for biodegradable food waste.

Mixing Performance of a Suspended Stirrer for Homogenizing Biodegradable Food Waste from Eatery Centers

Effective pre-treatment of food waste is important to ensure that subsequent treatment in a biogas plant works well. This paper describes a two-dimensional finite volume model for the design of a homogenizing system for bio-degradable food waste from eatery centers. The numerical solver incorporates the analysis of the property distribution for food waste slurry in a storage tank, while coupling the impact of mixing on the slurry fluid. The partial differential equations which describe the conservation of mass, momentum and energy are simulated. The simulation covered the mixing and heating cycles of the slurry. The slurry fluid was exposed to a pretreatment temperature of 600 C. With carrot-orange soup as the studied food waste, constant density and a temperature dependent viscosity are assumed. The predicted results for velocity, pressure and temperature distribution are discussed and a source term for mixing was proposed. This assessment of distribution of velocity and temperature is expected play a role in future studies and designs of a homogenizer for biodegradable food waste.

/pdf/design-of-a-homogenizing-system-for-bio-degradable-food-4gmpjivnz0.pdf

Design of a Homogenizing System for Bio-degradable Food Waste from Eatery Centres

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Mixing Performance of a Suspended Stirrer for Homogenizing Biodegradable Food Waste from Eatery Centers

Design of a Homogenizing System for Bio-degradable Food Waste from Eatery Centres