Accession Number:

AD0623617

Title:

EFFECT OF VIBRATION ON HEAT TRANSFER FROM CYLINDERS VIBRATED SINUSOIDALLY WITHIN A VERTICAL PLANE IN FREE CONVECTION

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Watson, William J.

Report Date:

1965-01-01

Pagination or Media Count:

58.0

Abstract:

Methods to increase the heat transfer rate from a body to its surroundings include the effects of vibration. The study is an investigation of the effect of sinusoidal vibration in a vertical plane on the heat transfer rate from a cylinder in free convection in air. Three different cylinders with diameters 0.072 in, 0.120 in, and 0.25 in were vibrated at amplitudes from 0 to 1.5 in, at frequencies from 16 to 80 cps, and at surface temperatures of 100F and 200F above room temperature. The heat transfer rate changes from that obtained in a free convection process to that obtained in a forced convection process at the conventional forced convection curve of McAdams and generally parallels this curve to Reynolds numbers as high as 1100 which was the highest obtained. For a given Reynolds number, the heat transfer rate is independent of the cylinder temperature and test position along the length of the cylinder. The results of this investigation agree closely with results previously presented for cylinders vibrated in free convection in air, regardless of the mode or method of vibration. The scope of the investigation was limited by vibrating characteristics of the cylinders, failure of the cylinders at higher temperatures, and the limited mass of the mounting assembly for the cylinders.

Descriptors:

• *CYLINDRICAL BODIES
• *HEAT TRANSFER
• REYNOLDS NUMBER
• CONVECTION
• THESES
• VIBRATION
• BOUNDARY LAYER

Subject Categories:

• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE