a mathematical model of heat transfer in a rotary

Heat Transfer in the Non

This paper presents a steady-state heat transfer model for a rotary kiln used for drying and preheating of wet solids with application to the non-reacting zone of a cement rotary kiln A detailed parametric study indicates that the influence of the controlling parameters such as percent water content (with respect to dry solids) solids flow

A simulation study of heat and mass transfer in a

Jun 01 2003A one-dimensional coupled heat and mass transfer model which is expected for use in designing and manufacturing of a honeycombed rotary desiccant wheel is presented in this paper The mathematical model has been validated using a real desiccant wheel and the calculation results are in reasonable agreement with the experimental data

HEAT AND MASS TRANSFER IN AROTARY KILN INCINERATOR

A mathematical model of rotary kiln incinerator was developed The model performs both heat and mass balances and heat transfer analyses in a rotary kiln combustor The heat transfer mechani m includes radiative convective and conductive heat transfer among combustion gases the

The influence of geometrical parameters on heat and mass

The mathematical model of rotary heat exchanger is based on the structure of the counter-flow heat exchanger model [12 24] Depending on the value of rotor speed or solid-to-airflow heat capacity rate ratio the effectiveness of the heat recovery depends on the two characteristic operating states: high speed (non-oscillation mode) and low

Mathematical modeling of pneumatic char injection in a

A mathematical model of heat transfer in a directly-fired rotary kiln is developed and used to examine the effects of operating and design parameters on burden temperature The model includes a mean beam length radiation model and axial zoning Conductive and convective heat transfer are

Convective heat transfer in a rotary kiln

An experimental study of convective heat transfer from hot air to the solid charge and walls in a non‐fired rotary kiln is reported Ottawa sand was heated by passing it counter‐current to a flow of preheated air in a 2 5 m 0 19 m I D rotary kiln

Numerical Modeling of Rotary Kiln Productivity Increase

Rotary kilns are used in many industrial processes ranging from cement manufacturing to waste incineration The operating conditions vary widely depending on the process While there are many models available within the literature and industry the wide range of operating conditions justifies further modeling work to improve the understanding of the processes taking place within the kiln

Mathematical modeling of heat transfer in counter

Jun 22 2017The performance of gas-drilling (drilling oil and gas wells with air nitrogen or natural gas) is very unpredictable in many areas due to lack of proper design of drilling parameters because of limited understanding of gas–rock interaction which requires knowledge of heat transfer in the well system Complete analysis of rock failure requires an accurate mathematical model to predict gas

MATHEMATICAL MODELING OF CONTINUOUS DRYERS USING THE HEAT

In this work a phenomenological mathematical model that describes the continuous drying process is presented Heat and mass transfer in gas phase solid phase and gas-solid interface were taking in account in the model In addition the equilibrium and interfaces conditions were evaluated using the product sorption isotherm

Performance modeling of radiant heat recovery exchangers

specific design criteria nor any mathematical model to analyse the performance of heat recovery systems for rotary kilns adopting external heat exchangers To fill this gap Caputo et al [5] presented a preliminary mathematical model of a recovery equipment configured as an array of

CiteSeerX — Mathematical Modeling of the Working Cycle of

Heat transfer coefficient required for computer simulation is experimentally obtained and used in performance prediction when the working medium being air or helium A mathematical model has been developed for calculating the compressor performance and for

CiteSeerX — Mathematical Modeling of the Working Cycle of

Heat transfer coefficient required for computer simulation is experimentally obtained and used in performance prediction when the working medium being air or helium A mathematical model has been developed for calculating the compressor performance and for

Modeling and Simulation of Heat Transfer Phenomena

Jun 10 2015A mathematical model was developed using standard transport equations incorporating all heat transfer coefficients to calculate the time for solidification of metal in casting and computer simulation of the model was carried out in C++ to validate the model

PERFORMANCE ANALYSIS OF PILOT ROTARY KILN FOR

The mathematical model (Ortiz et al 2003) accounts for the complex transfer and reaction phenomena which occur inside the rotary kiln The main processes in the kiln are: heat and mass transfer (drying zone) heat transfer (heating zone) and heat and mass transfer asso-ciated to the reaction (reaction zone) (Barr et al 1989)

Modeling of Pulverized Coal Combustion in Cement Rotary Kiln

function was introduced to take account of the thermal effect of clinker formation Combining the models of gas-solid flow heat and mass transfer and pulverized coal combustion a set of mathematical models for a full-scale cement rotary kiln were established In terms of commercial CFD code (FLUENT) the distributions

Computer simulation of a rotary dryer Part II: Heat and

A computer model of a single‐pass rotary‐drum dryer with or without a centerfill flighting section describes the drying behavior of wood particles within the drum This part of a two‐part study examines heat and mass transfer which are shown to be partly dependent on the pattern of

Influence of structure parameter and operation parameter

The connection between heat transfer in rotary kiln and the change of structure parameters and operation parameters was discussed The mathematical model of one-dimensional and steady-state heat transfer for the rotary kiln was established and the temperature field was calculated The results show that adjusting the Coal-fired capacity is a comparatively effective measure in controlling

Regenerative heat transfer in rotary kilns

A mathematical model has been developed to determine the temperature distribution in the wall of a rotary kiln The model which incorporates a detailed formulation of the radiative and convective heat-transfer coefficients in a kiln has been employed to examine the effect of different kiln variables on both the regenerative and the overall heat transfer to the solids

A Mathematical Model on Heat Mass Transfer Including

Jun 12 2020The present model is a generalization of the diffusion model The whole analysis is presented in nondimensional form The effects of shape parameter relaxation time parameters Luikov number Kirpichev number Biot number Kossovich number and Predvoditelev number on heat and mass transfer are discussed in detail

Mathematic simulation of heat transfer and operating

Oct 22 2013Abstract Based on the analysis of material motion in the axial direction heat transfer and mass transport processes in a rotary kiln and combining with pulverized coal combustion material pyrogenation cooling of furnace wall finally and heat transfer and mass transport equations the combined heat transfer mathematical model for alumina rotary kiln was built up

A Study of Parameters Influencing Wall

Heat transfer between a rotating wall and a bed of granular material is investigated Three specific areas of this problem are studied First a Stefan-type model is used to evaluate the importance of evaporation near the wall on the wall-to-bed heat transfer coefficient

Heat Transfer Modeling and Analysis of a Rotary

4 1 Heat transfer modeling in COMSOL Multiphysics The physics used in COMSOL is heat transfer The domains of rotary elements are solved for by using the heat transfer in solids The rotation of the elements is also defined The flue gas and the air to be heated are solved for by using the heat transfer

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A mathematical model for the unsteady state heat and mass transfer in regenerative rotary heat exchanger is derived and solved numerically by using finite difference method Triangular shape of the rotary matrix with silica gel (SiO2) that used as desiccant material is taken here The heat transfer