A One-Dimensional Model for Heat Transfer in Engine Exhaust Systems

Fu, Huiyu; Chen, Xiangdong; Shilling, Ian; Richardson, Steve

doi:10.4271/2005-01-0696

Cited by 15 publications

(5 citation statements)

References 3 publications

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“…External heat sources are fairly common in environments where MEMS find practical use. Examples include automotive and aerospace industry where high heat transfer rates and temperatures beyond 500°C are commonly available [9]. Another potential widespread source of heat for MEMS is found in modern electronic VLSI integrated circuits that may have power densities in excess of 40W/cm 2 [10,11].…”

Section: Design Conceptmentioning

confidence: 99%

Polysilicon vertical actuator powered with waste heat

Varona

Tecpoyotl-Torres

Hamoui

2008

2008 IEEE Custom Integrated Circuits Conference

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This paper presents a new micro thermal actuator with bi-directional vertical motion. Traditional thermal actuators require an electric current to generate heat by Joule effect and obtain motion via thermal expansion. This work offers a simplified polysilicon thermal actuator designed to operate with an external heat source and, for example, scavenge heat from the surrounding medium. The actuator was fabricated using a standard surface micromachining process (PolyMUMPs). The thermal actuation characteristics, analysis, and experimental results for this novel micro-mechanical device are provided to illustrate performance and potential applications.

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Section: Design Conceptmentioning

confidence: 99%

Polysilicon vertical actuator powered with waste heat

Varona

Tecpoyotl-Torres

Hamoui

2008

2008 IEEE Custom Integrated Circuits Conference

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“…In the following, the conversion efficiency is called η and is considered as a known function. 6 At a given time, the variation of L η modifies the sharpness of the conversion efficiency variations with respect to temperature and therefore the accuracy of the estimated efficiency. In details, the lower L η is, the sharper the conversion efficiency variations are.…”

Section: B Proposed Reduced Pde Modelmentioning

confidence: 99%

“…Further, a certain number of inlet gas temperature models have been proposed in the literature and can be used here if no sensor is available. For example, the interested reader can refer to [6] where a complex 1D model is presented or to [5] for lumped parameters exhaust temperature models.…”

Section: Comments About the Proposed Modelmentioning

confidence: 99%

“…For moderate temperature, the conversion efficiency highly depends on the wall temperature and this dependence cannot reasonably be neglected. a) Conversion efficiency representation: in this paper, we propose to represent the conversion efficiency of the catalyst as a function of a punctual wall temperature, at a position L η (potentially varying with aging) 6 . Experimental determination of an appropriate length L η and of the resulting efficiency was performed and follows the tendency of Fig.…”

Section: B Proposed Reduced Pde Modelmentioning

confidence: 99%

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Estimation of the distributed temperature of a SI engine catalyst for light-off strategy

Bresch‐Pietri

Leroy

Petit

2013

2013 European Control Conference (ECC)

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“…A sensitivity analysis of the main variables (heat transfer coefficient, external pipe emissivity and others) affecting heat transfer in exhaust pipes was carried out. Fu et al [9] developed a 1D model of an exhaust pipe (without the catalytic converter). Apart from typical variables studied, effects of pipe geometry and flow regime were investigated.…”

Section: Introductionmentioning

confidence: 99%

Developing Computational Fluid Dynamics (CFD) Models to Evaluate Available Energy in Exhaust Systems of Diesel Light-Duty Vehicles

et al. 2017

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Around a third of the energy input in an automotive engine is wasted through the exhaust system. Since numerous technologies to harvest energy from exhaust gases are accessible, it is of great interest to find time-and cost-efficient methods to evaluate available thermal energy under different engine conditions. Computational fluid dynamics (CFD) is becoming a very valuable tool for numerical predictions of exhaust flows. In this work, a methodology to build a simple three-dimensional (3D) model of the exhaust system of automotive internal combustion engines (ICE) was developed. Experimental data of exhaust gas in the most used part of the engine map in passenger diesel vehicles were employed as input for calculations. Sensitivity analyses of different numeric schemes have been conducted in order to attain accurate results. The model built allows for obtaining details on temperature and pressure fields along the exhaust system, and for complementing the experimental results for a better understanding of the flow phenomena and heat transfer through the system for further energy recovery devices.

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A One-Dimensional Model for Heat Transfer in Engine Exhaust Systems

Cited by 15 publications

References 3 publications

Polysilicon vertical actuator powered with waste heat

Polysilicon vertical actuator powered with waste heat

Estimation of the distributed temperature of a SI engine catalyst for light-off strategy

Developing Computational Fluid Dynamics (CFD) Models to Evaluate Available Energy in Exhaust Systems of Diesel Light-Duty Vehicles

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