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Browsing by Subject "Heat transfer"

Now showing items 1-20 of 65

A complete 0D thermodynamic predictive model for direct injection diesel engines

Payri González, Francisco; Olmeda, P.; Martín Díaz, Jaime; García Martínez, Antonio (Elsevier, 2011-06-01)

[EN] Ideal models provide the simplest way to reproduce internal combustion engine (ICE) cycles, but they usually do not represent with sufficient accuracy the actual behaviour of an ICE. A suitable alternative for research ...
A comprehensive methodology to analyse the Global Energy Balance in Reciprocating Internal Combustion Engines

Carreño Arango, Ricardo (Universitat Politècnica de València, 2016-11-02)

[EN] The main objective of this doctoral thesis is the development of a comprehensive methodology to perform and analyse the thermal balance of reciprocating engines, based on experimental and theoretical techniques. ...
A contribution to the global modeling of heat transfer processes in Diesel engines

Salvador Iborra, Josep (Universitat Politècnica de València, 2020-09-02)

[EN] Current challenges in research and development of powertrains demand new computational tools capable of simulating vehicle operation under very diverse conditions. This is due, among other reasons, to new homologation ...
A new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling

Benajes Calvo, Jesus Vicente; Olmeda González, Pablo Cesar; Martín Díaz, Jaime; Carreño Arango, Ricardo (Elsevier, 2014-10-05)

Combustion diagnosis based on in-cylinder pressure signals as well as 0D thermodynamic modelling, are widely used to study and optimize the combustion in reciprocating engines. Both approaches share some uncertainties ...
A study on the internal convection in small turbochargers. Proposal of heat transfer convective coefficients

Serrano Cruz, José Ramón; Olmeda González, Pablo Cesar; Arnau Martínez, Francisco José; Reyes Belmonte, Miguel Ángel; Tartoussi, Hadi (Elsevier, 2015-10-05)

Nowadays turbochargers play an important role in improving internal combustion engines (ICE) performance. Usually, engine manufacturers use computer codes to predict the behaviour of both engine and turbocharger, the ...
Accelerated mild heating of dry-cured ham by applying power ultrasound in a liquid medium

Contreras-Ruiz, Marina; Benedito Fort, José Javier; Bon Corbín, José; Garcia-Perez, J.V. (Elsevier, 2018)

[EN] Mild thermal treatments could be considered a feasible technique with which to improve the texture of dry-cured ham. This study explores the feasibility of using power ultrasound (PuS) to intensify heat transfer during ...
Adaptation of a 1-D tool to study transient thermal in turbocharger bearing housing

Serrano, J.R.; Tiseira, Andrés-Omar; García-Cuevas González, Luis Miguel; Rodriguez-Usaquen, Yuly Tatiana (Elsevier, 2018)

[EN] The heat transfer model can be used in a one-dimensional (1-D) engine simulation. When the engine speed is reduced to zero, the codes have been upgraded to calculate transient turbocharger thermal conditions. The ...
Advanced interface models for metal forming simulations

Schmid, Steven R.; Liu, J.; Sellés Cantó, Miguel Ángel; Pasang, Timotius (Elsevier, 2013-11)

Friction and heat transfer in metal forming simulations are usually restricted by software to be interface constants, a situation not reflected by the mechanics of real manufacturing processes. A better simulation approach ...
An analysis of the transient regime temperature field in wet grinding

González-Santander Martínez, Juan Luis; Isidro San Juan, José María; Martín, G. (Springer-Verlag, 2015)

[EN] In this paper, the Samara-Valencia model for heat transfer in grinding is considered. This model is particularized to the case of wet grinding, assuming a constant heat transfer coefficient on the workpiece surface ...
Análisis de la interacción de los procesos de inyección y combustión con el campo de velocidad dentro del cilindro en motores de encendido por compresión

Pachano Prieto, Leonardo Manuel (Universitat Politècnica de València, 2017-07-27)

Emission legislation together with the need of more fuel-efficient engines have driven the development of promising combustion concepts in compression ignition (CI) engines. Most of them, lead toward a lean and low temperature ...
Aportación a la mejora del fiagnóstico de la combustión y balances de energía para motores de combustión interna alternativos

Carreño Arango, Ricardo (Universitat Politècnica de València, 2014-09-25)

[EN] In the last 20 years, the research in engines has been centered principally in reducing the emissions and fulfills the normative. However, due to the high exigency of the current normative, the use of after treatment ...
Application of a zero-dimensional model to assess the effect of swirl on indicated efficiency

Broatch, A.; Martín, Jaime; García Martínez, Antonio; Blanco-Cavero, Diego; Warey, Alok; Domenech, Vicent (SAGE Publications, 2019-10)

[EN] Increasing internal combustion engine efficiency continues being one of the main goals of engine research. To achieve this objective, different engine strategies are being developed continuously. However, the assessment ...
Comparison of different modeling approaches for minichannel evaporators under dehumidification

Hassan, Abdelrahman-Hussein; Martinez-Ballester, Santiago; Gonzálvez-Maciá, José (Springer-Verlag, 2019-10)

[EN] This paper firstly presents a comprehensive minichannel evaporator model (MCHX-1D-MB) based on fin theory coupled with the moving boundary technique along fin height. To validate the presented model, experimental data ...
Contribución al modelado unidimensional en motores de dos tiempos de altas prestaciones

Jiménez Macedo, Víctor Daniel (Universitat Politècnica de València, 2013-07-08)

Un modelo de simulación presenta muchas ventajas en el campo del desarrollo de motores de combustión interna alternativos. Su utilidad es doble. Por un lado, para entender la naturaleza de los fenómenos físicos que suceden ...
Determination of heat flows inside turbochargers by means of a one dimensional lumped model

Olmeda González, Pablo Cesar; Dolz Ruiz, Vicente; Arnau Martínez, Francisco José; Reyes Belmonte, Miguel Ángel (Elsevier, 2013-04)

In the present paper, a methodology to calculate the heat fluxes inside a turbocharger from diesel passenger car is presented. The heat transfer phenomenon is solved by using a one dimensional lumped model that takes into ...
Development and validation of a finite element model for water - CO2 coaxial gas-coolers

Sanchez, D.; Cabello, R.; Llopis, R.; Torrella Alcaraz, Enrique (Elsevier, 2012-05)

The gas-cooler heat exchanger is a characteristic device of the refrigeration plants that use CO2 as the working fluid in transcritical conditions. The proper gas-cooler sizing, allows getting the maximum effectiveness in ...
Development of a soot radiation model for diesel flames

López, J. Javier; García-Oliver, José M; García Martínez, Antonio; Villalta-Lara, David (Elsevier, 2019-07-05)

[EN] This paper describes a radiation model for diesel sprays that can predict the heat losses based on spray characteristics to the spray plume due to radiation. The model is based on three sub-models: spray model, soot ...
DNS of thermal channel flow up to Re-tau=2000 for medium to low Prandtl numbers

Alcántara-Ávila, Francisco; Hoyas, S.; Pérez Quiles, María Jezabel (Elsevier, 2018)

[EN] Direct Numerical Simulations of turbulent heat transfer in a channel flow are presented for three different Reynolds numbers, namely Re-tau = 500, 1000 and 2000. Medium and low values of the molecular Prandtl number ...
Dynamic Identification of Thermodynamic Parameters for Turbocharger Compressor Models

Burke, R.D.; Olmeda González, Pablo Cesar; Serrano Cruz, José Ramón (American Society of Mechanical Engineers (ASME), 2015-10)

A novel experimental procedure is presented which allows simultaneous identification of heat and work transfer parameters for turbocharger compressor models. The method introduces a thermally transient condition and uses ...
Effect of in-cylinder swirl on engine efficiency and heat rejection in a light-duty diesel engine

Olmeda, P.; Martín, J.; Blanco-Cavero, Diego; Warey, A.; Domenech, V. (SAGE Publications, 2017)

[EN] During the last years, the growing awareness about the impacts of climate change lead to an increase in the importance of the efficiency over other criteria in the design of internal combustion engines. In this ...