0
Research Papers: Forced Convection

Heat Transport by Inverse-Piezoelectric Driven Dream Pipe

[+] Author and Article Information
Masao Furukawa

Department of Mechanical Systems Engineering,  Kogakuin University, 1-24-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo 163-8677, Japan e-mail: au40740@ns.kogakuin.ac.jp

J. Heat Transfer 133(10), 101701 (Aug 15, 2011) (9 pages) doi:10.1115/1.4004005 History: Received November 15, 2010; Revised April 12, 2011; Published August 15, 2011; Online August 15, 2011

A novel type of so-called dream pipe is introduced hoping for the high-efficiency heat removal. Unlike traditional types with mechanical shaker, this one fits up an inverse-piezoelectric-cells embedded thin disk coupled with ac power to cause oscillatory pipe flows. A theoretical approach is adopted to comprehensively describe thermal characteristics of that new device. With a view to obtaining more practical expressions than accepted before, the Galerkin method based on the variational principle is used to solve governing partial differential equations. The induced tidal displacement and the relative increase of thermal diffusivity are expressed in reduced algebraic form. Also presented are design formulas defining the specific driving power and the specific number of required tubes. Concerning the effective thermal diffusivity, the author’s predictions are fairly well consistent with exact ones deduced from Watson’s expression. Ratios of the two are linearly regressed to a cubic equation applicable to the frequency range from 0.5 Hz to 6.0 Hz. Recommendable coefficient values are listed in the table. Possible combinations of four fluids of interest and seven levels of the applied ac voltage are considered in a parametric study. Numerical results are graphically shown in the figures for discussion on the feasibility.

FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Inverse-piezoelectric driven dream pipe

Grahic Jump Location
Figure 2

Ratio of roughly to exactly estimated relative increase of thermal diffusivity

Grahic Jump Location
Figure 3

(a) Relative increase of thermal diffusivity of water; (b) relative increase of thermal diffusivity of ammonia; (c) relative increase of thermal diffusivity of toluene; (d) relative increase of thermal diffusivity of acetone

Grahic Jump Location
Figure 4

(a) Specific required electric power for water; (b) specific required electric power for ammonia; (c) specific required electric power for toluene; (d) specific required electric power for acetone

Grahic Jump Location
Figure 5

(a) Specific required number of tubes for water; (b) specific required number of tubes for ammonia; (c) specific required number of tubes for toluene; (d) specific required number of tubes for acetone

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In