Numerical Simulation of Heat Transfer from Three-dimensional Model of Human Head in Different Environmental Conditions

Hatami, Masoud; Bayareh, Morteza

doi:10.18280/ijht.370317

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Degradation zone 4 is characterized by a predominance of processes of increased wear, obsolescence of the burners and corresponds to the uncertain results of reducing the indicatorproperty under the destructive effects of regulatory factors. This is possible provided that the length of the initial ignition section depends on the shape and design features of the burner device [7,18]. For example, in a jet of a gas torch of a finite size using self-modeling and integral values of the pulse flux, excess enthalpy and excess concentration, it is possible to determine the dimensionless length of the torch by the formula:…”

Section: Methodology Of Combining Methods For Modeling Heat and Mass mentioning

confidence: 99%

Approximation Methods for Analysis and Formation of Mechanisms for Regulating Heat and Mass Transfer Processes in Heat Equipment Systems

Alabugin¹,

Aliukov²,

Осинцев³

2020

IJHT

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The need to increase the accuracy of decisions and the depth of analysis of complex heat power systems determines the relevance of modeling and regulation of heat and mass transfer processes with the development of theoretical models and the development of a new methodology. Uncertainty of the environment increases the significance of the problems of insufficient efficiency of the available numerical approaches to the modeling of dynamic processes and the regulation of heating elements. Therefore, the aim of the article was to develop the applied aspects of the theory of solving nonlinear problems, provisions of the analytical methodology and the methods for regulating stepwise thermodynamic processes based on adapted tools for approximating generalized and step functions. The following tasks were solved: the structure of mechanisms was determined, including regulators of the energy efficiency of the flare device of the boiler unit with an expanded combustion zone; a model of integration-balancing regulation of heat transfer with four types of unsteady processes determined by indicators of changes in the direction and sign of the entropy of the effects of the regulators is proposed. Quantitative meters of energy efficiency of combustion and heat transfer processes in boiler units have been developed. Mathematical adapted and developed technical and organizational methods for solving problems: approximation of the original functions (generalized Dirac and stepwise) by a sequence of recursive periodic functions; simulation of spasmodic heat transfer processes based on step functions; structuring the mechanism for regulating heat transfer, including four types of regulators; empirical modeling of the assessment and regulation of energy efficiency, taking into account the directivity and severity of the effects of regulators displayed by derivatives of higher orders of approximation of energy efficiency functions. The results were obtained: mathematical ones were adapted and new approximation models for generalized functions were built; quantitative measuring instruments of process dynamics for regulating the technical and organizational mechanisms of heat transfer were obtained.

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Section: Methodology Of Combining Methods For Modeling Heat and Mass mentioning

confidence: 99%

Approximation Methods for Analysis and Formation of Mechanisms for Regulating Heat and Mass Transfer Processes in Heat Equipment Systems

Alabugin¹,

Aliukov²,

Осинцев³

2020

IJHT

View full text Add to dashboard Cite

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“…The mathematical models describing heat transfer proceedings in the vital tissues are usually based on the most popular Pennes equation [9][10][11][12][13][14][15] and this approach has been adopted to modeling of heat transfer processes proceeding in the polyp-colon system. The typical Pennes equation contains two terms (heat sources) associated with the blood perfusion and metabolism in tissues.…”

Section: Figure 1 Scheme Of Surgical Operation In Polypectomymentioning

confidence: 99%

Mathematical Modelling of Thermal and Electrical Processes in the Polyp-Colon System During Electrosurgical Polypectomy

Ciesielski¹,

Siedlecki²,

Janik³

2020

IJHT

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In this paper, the mathematical model of the electrical and thermal processes proceeding during the electrosurgical polypectomy is considered. During a colonoscopy, the endoscopist can remove abnormal growths (polyps) inside the large intestine (the colon). In the electrosurgical polypectomy procedure, a polypectomy snare is tightened around the base of the polyp. Next, the electric current flows for a short moment of time from the snare loop (the first electrode), through the polyp-colon tissues and the other body tissues, to the second electrode placed on the patient's skin. Both electrodes are connected to the electrosurgical generator unit. This medical surgery allows to cut off the polyp stalk from the colon wall. The systems of the partial differential equations that describe the thermal and electrical processes with the appropriate initial-boundary conditions are proposed. The examples of numerical simulations related to two duty cycles of the electrosurgical generator unit are presented. Simulation results can be helpful for the surgeons to choose the optimal heating time and to set other parameters of the electric current that flows by tissues during the endoscopy procedure.

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Asynchronous Injection-Production Process: A Method to Improve Water Flooding Recovery in Complex Fault Block Reservoirs

Yuan

Wang

Jiang

et al. 2020

Mathematical Problems in Engineering

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The complex fault block reservoir has the characteristics of small area and many layers in vertical. Due to the influence of formation heterogeneity and well pattern, the situation that “water fingering is serious with water injection, on the contrary, driving energy is low” frequently occurs in water flooding, which makes it difficult to enhance oil recovery. Asynchronous injection-production (AIP) process divides the conventional continuous injection-production process into two independent processes: injection stage and production stage. In order to study oil recovery in the fault block reservoir by AIP technology, a triangle closed block reservoir is divided into 7 subareas. The result of numerical simulation indicates that all subareas have the characteristic of fluid diverting and remaining oil in the central area is also affected by injected water at injection stage of AIP technology. Remaining oil in the central area is driven to the included angle and border area by injected water and then produced at the production stage. Finally, the oil recovery in the central area rises by 5.2% and in the noncentral area is also increased in different levels. The AIP process can realize the alternative change of reservoir pressure, change the distribution of flow field, and enlarge the swept area by injected water. To sum it up, the AIP process is an effective method to improve the oil recovery in complex fault-block reservoir by water flooding.

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Numerical Simulation of Heat Transfer from Three-dimensional Model of Human Head in Different Environmental Conditions

Cited by 3 publications

References 22 publications

Approximation Methods for Analysis and Formation of Mechanisms for Regulating Heat and Mass Transfer Processes in Heat Equipment Systems

Approximation Methods for Analysis and Formation of Mechanisms for Regulating Heat and Mass Transfer Processes in Heat Equipment Systems

Mathematical Modelling of Thermal and Electrical Processes in the Polyp-Colon System During Electrosurgical Polypectomy

Asynchronous Injection-Production Process: A Method to Improve Water Flooding Recovery in Complex Fault Block Reservoirs

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