Browse Publications Technical Papers 2019-01-0149
2019-04-02

Estimates of the Convective Heat-Transfer Coefficients for Under-Hood and Under-Body Components 2019-01-0149

In this paper we investigate the application of time constant to estimate the external heat transfer coefficient (h) around specific vehicle components. Using this approach, a test sample in the form of a steel plate is placed around the component of interest. A step change is applied to air temperature surrounding the sample. The response of the sample temperature can be analyzed and the heat transfer coefficient can therefore be calculated. Several test samples were installed at several locations in the vehicle under-hood and underbody. A series of vehicle tests were designed to measure the time constant around each component at various vehicle speeds. A correlation between estimated heat transfer coefficients and vehicle speed was generated. The developed correlations and the measured component ambient temperatures can be readily used as input for thermal simulation tools. This approach can be very helpful whenever CFD resources may not be available. Verification of the derived coefficients was conducted by comparing the derived heat transfer coefficients to those derived through detailed CFD analysis. Assumptions, limitations and applications of this approach are discussed.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Virtual Downhill Brake Cooling Evaluation Methodology

2015-36-0159

View Details

JOURNAL ARTICLE

Transient Dip Paint Simulation of Entire Car Bodies within One Day

2015-01-0731

View Details

TECHNICAL PAPER

Modeling Experience on Friction Stir Welding Using FLUENT

2005-01-1245

View Details

X