Investigation into Natural Convection in an Underhood Model Under Heat Soak Condition

Franchetta, M; Suen, K.O.; Williams, Paul; Bancroft, T. G.

doi:10.4271/2005-01-1384

Cited by 17 publications

(4 citation statements)

References 7 publications

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“…Several previous studies have concentrated on the investigation of buoyancy-driven flow in the engine bay using coupled 1D-3D simulations. Franchetta et al [6,7] considered a half-scale engine compartment to perform experimental and numerical investigation of natural convection during thermal soak. A number of works used a full-scale size model that makes possible to capture the transient flow structures [8,9].…”

Section: Intoductionmentioning

confidence: 99%

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

et al. 2019

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Energy efficient vehicles are essential for a sustainable society and all car manufacturers are working on improved energy efficiency in their fleets. In this process, an optimization of aerodynamics and thermal management is most essential. The objective of this work is to improve the energy efficiency using encapsulated heat generating units by focusing on predicting temperature distribution inside an engine bay. The overall objective is to make an estimate of the generated heat inside an encapsulation and consecutively use this heat for climatization purposes. The study presents a detailed numerical procedure for predicting buoyancy-driven flow and resulting natural convection inside a simplified vehicle underhood during thermal soak and cool-down events. The procedure employs a direct coupling of one-dimensional and three-dimensional methods to carry out transient one-dimensional thermal analysis in the engine solids synchronized with sequences of steady-state three-dimensional simulations of the fluid flow. The boundary heat transfer coefficients and averaged fluid temperatures in the boundary cells, computed in the three-dimensional fluid flow model, are provided as input data to the one-dimensional analysis to compute the resulting surface temperatures which are then fed back as updated boundary conditions in the flow simulation. The computed temperatures of the simplified engine and the exhaust manifolds during the thermal soak and cool-down period are in favorable agreement with experimental measurements. The present study illustrates the capabilities of the coupled thermal-flow methodology to conduct accurate and fast computations of buoyancy-driven heat transfer. The methodology can be potentially applied to design and analysis of multiple demand vehicle thermal management systems in hybrid and electrical vehicles.

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Section: Intoductionmentioning

confidence: 99%

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

et al. 2019

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“…Numerical simulations appear to be an appropriate means to satisfy these requirements and have the potential to reduce the amount of prototypes [23]. These numerical simulations concern mainly the investigation of the thermal soak phase of a vehicle where the flow is buoyancy driven [24,25], the underhood compartment thermal management of passenger cars and trucks [26], the exhaust system during cold start emissions [27], diesel engine with a dual-loop Exhaust Gas Recirculation EGR system [28], the airflow over a radiator and convex and concave tubes [29,30] and vehicle suspension system [31]. However, the simulation means need to be validated by experimentally using prototypes [32,33] and real vehicles [34,35].…”

Section: Introductionmentioning

confidence: 99%

Review of underhood aerothermal management: Towards vehicle simplified models

Khaled

Ramadan

El-Hage

et al. 2014

Applied Thermal Engineering

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“…Experimental analyses [2,3] of these phenomena are rare and studies usually focus on the temperature analysis, referring mainly to numerical simulations [4][5][6][7][8][9]. It is therefore important to obtain an experimental database on the heat fluxes exchanged.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity and applications of a new method for the simultaneous measurement of convective and radiative heat flux in underhood applications—toward multiple versions

Khaled

Shaer

Ramadan

et al. 2014

Meas. Sci. Technol.

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Convective and radiative heat fluxes enter simultaneously into most thermal engineering applications, especially in the vehicle underhood. However, separate measurements of these fluxes are needed for understanding and analyzing underhood aerothermal phenomena. In this context, a new experimental technique has been proposed (Khaled et al 2010 Meas. Sci. Technol. 21 025903) that allows the simultaneous measurement of convective and radiative heat fluxes. The technique uses a pair of fluxmeters with different radiative properties: the two fluxmeters measure the same convective flux but different radiative fluxes proportional to the fluxmeters’ emissivities. This permits the separate calculation of the convective and radiative fluxes. This paper presents a sensitivity and applicability analysis of the new technique, taking into account the effects of a number of parameters such as emissivities, the precision of emissivity estimation and the difference in convective heat fluxes due to fluxmeter position. Also, new applications of this novel technique are proposed as an alternative when the initial version becomes inaccurate.

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Investigation into Natural Convection in an Underhood Model Under Heat Soak Condition

Cited by 17 publications

References 7 publications

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

A Coupled 1D–3D Numerical Method for Buoyancy-Driven Heat Transfer in a Generic Engine Bay

Review of underhood aerothermal management: Towards vehicle simplified models

Sensitivity and applications of a new method for the simultaneous measurement of convective and radiative heat flux in underhood applications—toward multiple versions

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