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Title: Pin stack array for thermoacoustic energy conversion

A thermoacoustic stack for connecting two heat exchangers in a thermoacoustic energy converter provides a convex fluid-solid interface in a plane perpendicular to an axis for acoustic oscillation of fluid between the two heat exchangers. The convex surfaces increase the ratio of the fluid volume in the effective thermoacoustic volume that is displaced from the convex surface to the fluid volume that is adjacent the surface within which viscous energy losses occur. Increasing the volume ratio results in an increase in the ratio of transferred thermal energy to viscous energy losses, with a concomitant increase in operating efficiency of the thermoacoustic converter. The convex surfaces may be easily provided by a pin array having elements arranged parallel to the direction of acoustic oscillations and with effective radial dimensions much smaller than the thicknesses of the viscous energy loss and thermoacoustic energy transfer volumes.
Inventors:
 [1];  [2]
  1. (Monterey, CA)
  2. (Santa Fe, NM)
Issue Date:
OSTI Identifier:
870101
Assignee:
Regents of University of California (Alameda, CA) LANL
Patent Number(s):
US 5456082
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
stack; array; thermoacoustic; energy; conversion; connecting; heat; exchangers; converter; provides; convex; fluid-solid; interface; plane; perpendicular; axis; acoustic; oscillation; fluid; surfaces; increase; ratio; volume; effective; displaced; surface; adjacent; viscous; losses; occur; increasing; results; transferred; thermal; concomitant; operating; efficiency; easily; provided; elements; arranged; parallel; direction; oscillations; radial; dimensions; thicknesses; loss; transfer; volumes; operating efficiency; convex surfaces; energy converter; energy losses; fluid volume; plane perpendicular; volume ratio; energy transfer; heat exchange; heat exchanger; thermal energy; energy conversion; heat exchangers; acoustic energy; ratio results; thermoacoustic energy; arranged parallel; elements arranged; radial dimension; energy loss; convex surface; fluid-solid interface; converter provides; /62/