FINITE ELEMENT ANALYSIS OF HEAT FLOW AROUND BURIED PIPES

THIS RESEARCH PRESENTS A GENERAL COMPUTER-ORIENTED SOLU- TION TECHNIQUE FOR GEOTECHNICAL PROBLEMS FO HEAT CONDUCTION, INCLUDING THE EFFECT OF LATENT HEAT GENERATION OR ABSORP- TION. A VARIATIONAL PRINCIPLE IS APPLIED FOR INITIAL BOUND- ARY VALUE PROBLEMS OF UNSTEADY HEAT FLOW, AND THE NUMERICAL METHODS OF FINITE ELEMENTS IS USED TO GENERATE APPROXIMATE SOLUTIONS TO PLANE AND AXISYMMETRIC PROBLEMS. VARIATION IN PHYSICAL AND THERMAL PROPERTIES OF MATERIALS WITH BOTH TEMPERATURE AND SPACE, AND FUNCTIONAL RELATIONSHIPS BETWEEN THE AMOUNT OF WATER FROZEN AND THE TEMPERATURE ARE TAKEN INTO ACCOUNT AUTOMATICALLY DURING THE PROCESS OF HEAT CON- DUCTION. THE PRESENT CONFIGURATION OF THE COMPUTER PROGRAM IS DESIGNED TO STUDY THE CHANGES IN THE THERMAL REGIME EFFECTED BY THE PRESENCE OF A PIPELINE CARRYING HOT FLUIDS THROUGH OR ABOVE PERMAFROST. PROPOSALS TO BUILD OIL PIPELINES ACROSS ALASKA AND NORTHWESTERN CANADA HAVE PROVIDED THE RESEARCH MOTIVATION. THE FINITE ELEMENT TECHNIQUE IF FIRST CHECKED BY APPLYING IT TO PROBLEMS OF FREEZING WATER AND MELTING ICE FOR WHICH EXACT SOLUTIONS ARE AVAILABLE. A GOOD AGREEMENT BETWEEN THE TWO IS OBTAINED. OTHER APPLICATIONS OF THE NEWLY DEVELOPED PROCEDURE ARE MADE IN TWO DIMENSIONAL GEOTECHNICAL HEAT CONDUCTION PROBLEMS IN A PERMAFROST ENVIRONMENT. THE TWO MAIN CLASSES OF PROBLEMS ARE: (1) DETERMINATION OF TRANSIENT TEMPERATURE DISTRIBU- TION AROUND BURIED HOT FLUID PIPES IN INFINITE FROZEN REGIONS; AND (2) DETERMINATION OF TRANSIENT TEMPERATURE DISTRIBUTIONS AROUND BURIED INSULATED AND UNINSULATED HOT FLUID PIPES NEAR THE SURFACE OF INITIALLY FROZEN GROUND. SOME CONCLUSIONS ARE DRAWN WITH RESPECT TO THE EFFECTS ON HEAT FLOW AND THERMAL REGIME OF: MATERIAL TYPE, INSULATION, BOUNDARY CONDITIONS, AND VARIOUS OTHER PARAMETERS.

  • Supplemental Notes:
    • 4 APP
  • Corporate Authors:

    Purdue University

    School of Aeronautics and Astronautics
    West Lafayette, IN  United States  47907
  • Authors:
    • Mohan, A
  • Publication Date: 1973-8

Media Info

  • Features: Figures; Tables;
  • Pagination: 201 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00236741
  • Record Type: Publication
  • Report/Paper Numbers: Thesis
  • Files: TRIS
  • Created Date: Feb 12 1974 12:00AM