Incorporating Nucleate Boiling in a Precision Cooling Strategy for Combustion Engines

Campbell, N A F; Tilley, D G; Macgregor, Stuart A.; Wong, Ling Tim

doi:10.4271/971791

Cited by 18 publications

(6 citation statements)

References 18 publications

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“…It is important to notice, however, that any lack of control on vapor generation could have catastrophic consequences associated with material overheating (Campbell and Hawley 2003). In this sense, precision cooling appears to provide the best frame for the exploitation of nucleate boiling without excessive risk (Campbell et al 1997;Robinson et al 1999). In that case, a remaining issue to be addressed would be the eventual problems related with the presence of bubbles in the small crosssection ducts characteristic of precision cooling.…”

Section: Introductionmentioning

confidence: 99%

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa

Broatch

Olmeda

et al. 2016

JAFM

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Current trends in engine design indicate the necessity to take advantage of the highest rates of heat transfer associated with nucleate boiling, mostly at high engine loads. When used in conjunction with advanced thermal management strategies, subcooled boiling may take place at very low velocities, for which little information is available, and in ducts with small cross-sectional area, so that undesired effects of the relative sizes of ducts and bubbles may appear. In this paper, experiments on subcooled boiling flow at low velocities and engine-like temperature conditions were conducted with a usual engine coolant. A high-speed photographic camera was used to collect images of the detached vapor bubbles, and the microscopic characteristics of the heating surface were determined. Experimental results for the mean values show acceptable agreement with the results of a mechanistic radius model, when assuming that departure and lift-of radius are related through the flow boiling suppression factor. Additionally, the results obtained are compatible with the sizes of the nucleation sites estimated from the surface characterization. The results obtained for the size distribution are consistent with those found in the literature.

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Section: Introductionmentioning

confidence: 99%

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa

Broatch

Olmeda

et al. 2016

JAFM

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“…The influence of heat transfer material, cooling water cavity structure, cooling medium and surrounding environment on heat transfer characteristics are studied in view of the convection heat transfer in the cooling system. In 1999, Campbell [34] studied the effect of different roughness of the water chamber surface on the boiling heat transfer characteristics of diesel engine. The results show that the wall heat transfer rate of rough cast iron is higher than that of machined and polished surface when the same wall superheat is maintained.…”

Section: B Heat Transfer Characteristics Between the Heated Componenmentioning

confidence: 99%

Recent Advancement of Cooling and Heat Transfer of Diesel Engine

Yang

Liu

Jiao³

et al. 2018

Proceedings of the 2018 2nd International Conference on Applied Mathematics, Modelling and Statistics Application (AMMSA 2018)

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The study of diesel cooling and heat transfer can improve thermal efficiency and reduce exhaust emissions. The research on the heat transfer characteristics of diesel engine block, the influence of the cooling medium control parameters on the heat transfer characteristics of the cooling system and environmental boundary conditions on the heat transfer characteristics of the diesel engine are elaborated, which as the breakthrough point of the research on the cooling heat transfer of diesel engine. The further development direction is discussed. It is pointed out that the research on the content of the best nanoparticles in the nanofluids, the durability test of the low heat rejection (LHR) diesel engine and the intelligent integrated control of the cooling system of the diesel engine at plateau are the key points of the research on the cooling and heat transfer of the diesel engine in the future.

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“…Proposed improvements range from the introduction of electronically controlled coolant pumps Cho et al, 2005), fans, shutters, and thermostats (Chanfreau et al, 2003;Chalgren and Barron, 2005), in which the potential offered by computerized control technologies is exploited, to the implementation of different techniques, such as precision cooling (Robinson et al, 1999), nucleate boiling (Campbell et al, 1997), evaporative cooling (Porot et al, 1997), thermal insulation of walls (Jaichandar and Tamilporai, 2003), intake air heating (Payri et al, 2006a), and flame heaters (Park, 2007).…”

Section: Introductionmentioning

confidence: 98%

Assessment of the influence of different cooling system configurations on engine warm-up, emissions and fuel consumption

Torregrosa

Broatch

Olmeda

et al. 2008

Int.J Automot. Technol.

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One of the major goals of engine designers is the reduction of fuel consumption and pollutant emissions while keeping or even improving engine performance. In recent years, different technical issues have been investigated and incorporated into internal combustion engines in order to fulfill these requirements. Most are related to the combustion process since it is responsible for both fuel consumption and pollutant emissions. Additionally, the most critical operating points for an engine are both the starting and the warming up periods (the time the engine takes to reach its nominal temperature, generally between 80ºC and 90ºC), since at these points fuel consumption and pollutant emissions are larger than at any other points. Thus, reducing the warm-up period can be crucial to fulfill new demands and regulations. This period depends strongly on the engine cooling system and the different strategies used to control and regulate coolant flow and temperature. In the present work, the influences of different engine cooling system configurations on the warm-up period of a Diesel engine are studied. The first part of the work focuses on the modeling of a baseline engine cooling system and the tests performed to adjust and validate the model. Once the model was validated, different modifications of the engine coolant system were simulated. From the modelled results, the most favourable condition was selected in order to check on the test bench the reduction achieved in engine warm-up time and to quantify the benefits obtained in terms of engine fuel consumption and pollutant emissions under the New European Driving Cycle (NEDC). The results show that one of the selected configurations reduced the warm-up period by approximately 159 s when compared with the baseline configuration. As a consequence, important reductions in fuel consumption and pollutant emissions (HC and CO) were obtained.

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Incorporating Nucleate Boiling in a Precision Cooling Strategy for Combustion Engines

Cited by 18 publications

References 18 publications

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Recent Advancement of Cooling and Heat Transfer of Diesel Engine

Assessment of the influence of different cooling system configurations on engine warm-up, emissions and fuel consumption

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