Numerical Investigation of Geometry Effects on Flow, Heat Transfer and Defrosting Characteristics of a Simplified Automobile Windshield with a Single Row of Impinging Jets

Du, Xuzhi; Yang, Zhigang; Zhou, Hua; Li, Qiliang; Jin, Zheyan

doi:10.4271/2016-01-0208

Cited by 12 publications

(4 citation statements)

References 57 publications

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“…Since the heat conduction within the windshield was governed by a partial differential equation as given by equation (17), the corresponding temperature variation was supposed to be a function of both spatial position and time. In this study, the commercial code FLUENT 16.1, 30 based on a finite volume method, was used to solve the second-order nonlinear partial differential equation on quadrilateral meshes (Figure 3(b)).…”

Section: Numerical Solution Methodologymentioning

confidence: 99%

“…an impinging jet heat transfer) was actively triggered during a nocturnal cooling process, then h in could be largely enhanced to reach a level of 10 to even 40 times the baseline value. 17,42 Consequently, similar to the potential control of k w and ε rad , by employing the control factor h in with a wider variation range (e.g. making h in vary from 3.85 to 53.58), the response of Δ T super f could be achieved based on the present mathematical model as shown in Figure 16.…”

Section: Potential Control Strategymentioning

confidence: 98%

“…[13][14][15][16][17][18] However, under certain severe conditions, frosting on an automobile windshield still remains a problem with respect to driving safety, customer satisfaction, and even the driving range of electric vehicle. 15,17,[18][19][20] Meanwhile, to the authors' best knowledge, the numerical prediction as well as the parameter sensitivity analysis and potential control of the occurrence of frosting has not yet been studied, especially for an automobile windshield which is involved in complex thermal physics under practical nocturnal radiative cooling and freezing conditions. In this context, it is of particular interest to identify the influence of each associated factor as well as the feasibility of potential control of the occurrence of frosting.…”

Section: Introductionmentioning

confidence: 99%

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A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

Yang

Jin

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this work, a simplified mathematical model, concerned with transient heat conduction as well as convective and radiative heat transfer, was developed to predict the variations of temperature and supercooling of the windshield during practical nocturnal cooling processes of a car. Final supercooling [Formula: see text] was introduced as an indicator to evaluate the probability of occurrence of frosting. Following that, the Taguchi statistical method was used to conduct a parameter sensitivity analysis and then figure out the potential control strategies for frosting suppression. The results showed that relative humidity had the most significant influence on the distribution of supercooling during the nocturnal cooling period, whereas the initial temperature as well as the thickness and thermal conductivity of the windshield played a minor role in it. An increase in relative humidity resulted in a significant increase in [Formula: see text], which might be expected to trigger an earlier initiation of frosting. The emissivity of the windshield, concerned with the nocturnal radiation potential, showed a considerable effect on the response of [Formula: see text], whereas the influence of the total opaque cloud amount appeared to be largely limited. In addition, through a potential control of the thermal conductivity of the windshield, [Formula: see text] just exhibited a very limited decline, thus contributing little to frosting mitigation. However, with a moderate potential control of the internal convective heat transfer coefficient, the frosting behavior might be effectively suppressed under a severe condition that favored the occurrence of icing. Besides, by introducing a combined control of the emissivity of the windshield and the internal convective heat transfer coefficient, [Formula: see text] could be well reduced to a value below zero even as the relative humidity increased up to 90%, which was supposed to prevent the occurrence of frosting under a far severer condition.

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Section: Numerical Solution Methodologymentioning

confidence: 99%

Section: Potential Control Strategymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

Yang

Jin

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The SST k-ω turbulence model was used with standard model coefficients embedded in ANSYS Fluent (v. 19.2). The SST model considers the transfer of turbulent shear stress when determining turbulent viscosity, which makes this model quite accurate and reliable for a wide class of flows [42,43].…”

Section: Gas Flow Modelmentioning

confidence: 99%

Numerical Study of the Thermal and Hydraulic Characteristics of Plate-Fin Heat Sinks

Soloveva,

Solovev,

Shakurova

2024

Processes

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One of the main trends in the development of the modern electronics industry is the miniaturization of electronic devices and components. Miniature electronic devices require compact cooling systems that can dissipate large amounts of heat in a small space. Researchers are exploring ways to improve the design of the heat sink of the cooling system in such a way that it increases the heat flow while at the same time reducing the size of the heat sink. Researchers have previously proposed different designs for heat sinks with altered fin shapes, perforations, and configurations. However, this approach to optimizing the design of the heat sink results in an increase in the labor intensity of its production. Our goal is to optimize the heat sink design to reduce its size, reduce metal consumption, and increase heat flow. This goal is achieved by changing the number of fins and the distance between them. In this case, there is no significant difference in the geometry of a conventional plate-fin heat sink, and a low labor intensity of production is ensured. A numerical investigation of heat flow and pressure drop in models of plate-fin heat sinks of various sizes and metal volumes was conducted using the ANSYS Fluent software package (v. 19.2) and computational fluid dynamics employing the control volume method. We used the SST k-ω turbulence model for the calculations. The research results showed that by changing the number of fins and the distance between them, it is possible to increase the heat flow from the heat sink to 24.44%, reduce its metal consumption to 6.95%, and reduce its size to 30%. The results of this study may be useful to manufacturers of cooling systems who seek to achieve a balance between the compactness of the heat sink and its ability to remove large amounts of heat.

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Improvement of Defogging Performance of Automobile Defroster using Vortex Generators

et al. 2020

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Numerical Investigation of Geometry Effects on Flow, Heat Transfer and Defrosting Characteristics of a Simplified Automobile Windshield with a Single Row of Impinging Jets

Cited by 12 publications

References 57 publications

A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

Numerical Study of the Thermal and Hydraulic Characteristics of Plate-Fin Heat Sinks

Improvement of Defogging Performance of Automobile Defroster using Vortex Generators

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