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Title:

A THEORETICAL ANALYSIS OF HYDROPLANING PHENOMENA

Accession Number:

00223325

Record Type:

Component

Abstract:

RESULTS OBTAINED IN A THEORETICAL STUDY OF PHENOMENA ENCOUNTERED WHEN AN AUTOMOTIVE TIRE ROLLS OR SKIDS ON A PAVEMENT COVERED WITH A WATER FILM ARE DISCUSSED. THE ANALYSIS IS BASED ON A MATHEMATICAL MODEL IN WHICH THE FLOW IS DIVIDED INTO A FOOTPRINT REGION, AN INLET REGION FORWARD OF THE FOOTPRINT REGION WHERE THE GAP BETWEEN THE TIRE AND THE PAVEMENT IS COMPARATIVELY LARGE, AND AN EXTERIOR FLOW REGION. IN PARTIAL HYDROPLANING, A THICK FLUID FILM PENETRATES BETWEEN THE TIRE AND PAVEMENT OVER A PORTION OF THE FOOTPRINT WHILE "SEMIDRY CONTACT" IS ASSUMED TO EXIST IN THE REMAINDER OF THE FOOTPRINT. THE FLOW THROUGH THE SEMIDRY PORTION OF THE FOOTPRINT IS ANALYZED USING EFFECTIVE FILM THICKNESSES BASED ON PAVEMENT DRAINAGE CHARACTERISTICS. IT IS FOUND THAT IN SOME CASES THREE-DIMENSIONAL FLOW EFFECTS APPRECIABLY LOWER THE LIFT COEFFICIENTS DEVELOPED BY HYDROPLANING TIRES. THE COMPUTED VARIATIONS OF THE THICK-FILM PENETRATION DISTANCE AND TOTAL FRICTION COEFFICIENT WITH FORWARD SPEED ARE GIVEN FOR THE CASE OF PARTIAL HYDROPLANING AND DISCUSSED IN RELATION TO EXPERIMENTAL RESULTS. THE GEOMETRY AND TIRE DEFORMATIONS OF THE THICK-FILM REGION PROVE TO BE IMPORTANT PARAMETERS IN STUDYING PARTIAL HYDROPLANING. /AUTHOR/

Supplemental Notes:

Paper sponsored by Committee on Surface Properties--Vehicle Interaction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Accession #:

01410250

Authors:

Daughaday, H
Balmer, G G

Pagination:

pp 1-10

Publication Date:

1970

Serial:

Highway Research Record

Issue Number: 311
Publisher: Highway Research Board

Media Type:

Digital/other

Features:

Figures (8) ; References (6)

Uncontrolled Terms:

Film thickness

Old TRIS Terms:

Subject Areas:

Highways; Safety and Human Factors; Vehicles and Equipment

Files:

TRIS, TRB

Created Date:

Nov 23 2000 12:00AM

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