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Title: Micromachined evaporators for AMTEC cells

Abstract

To achieve high cell efficiency and reliability, the capillary pumping system for Alkali Metal Thermal to Electric Conversion (AMTEC) must have three key characteristics: (1) very small pores to achieve a high capillary pumping head, (2) high permeability for the flow of liquid sodium to minimize internal losses, and (3) be made from a material that is exceptionally stable at high temperatures in a sodium environment. The authors have developed micromachining techniques to manufacture high performance evaporators for AMTEC cells. The evaporators have been fabricated from stainless steel, molybdenum, and a niobium alloy (Nb-1Zr). The regular, micromachined structure leads to very high capillary pumping head with high permeability for liquid flow. Data from tests performed with common fluids at room temperature characterize the capillary pumping head and permeability of these structures. Three micromachined evaporators have been built into AMTEC cells and operated at temperatures up to 1,100 K. Results from these tests confirm the excellent pumping capabilities of the micromachined evaporators.

Authors:
;  [1]
  1. Creare Inc., Hanover, NH (United States)
Publication Date:
Sponsoring Org.:
National Aeronautics and Space Administration, Washington, DC (United States)
OSTI Identifier:
452149
Report Number(s):
CONF-960805-
TRN: IM9715%%181
Resource Type:
Book
Resource Relation:
Conference: 31. intersociety energy conversion engineering conference, Washington, DC (United States), 9-14 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 31. intersociety energy conversion engineering conference. Volume 4: Complete table of contents, post deadline papers, additional papers, index; Chetty, P.R.K.; Jackson, W.D.; Dicks, E.B. [eds.]; PB: 190 p.
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; THERMOELECTRIC GENERATORS; EVAPORATORS; PERFORMANCE; MACHINING; CAPILLARY FLOW; EXPERIMENTAL DATA; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Izenson, M.G., and Crowley, C.J. Micromachined evaporators for AMTEC cells. United States: N. p., 1996. Web.
Izenson, M.G., & Crowley, C.J. Micromachined evaporators for AMTEC cells. United States.
Izenson, M.G., and Crowley, C.J. Tue . "Micromachined evaporators for AMTEC cells". United States.
@article{osti_452149,
title = {Micromachined evaporators for AMTEC cells},
author = {Izenson, M.G. and Crowley, C.J.},
abstractNote = {To achieve high cell efficiency and reliability, the capillary pumping system for Alkali Metal Thermal to Electric Conversion (AMTEC) must have three key characteristics: (1) very small pores to achieve a high capillary pumping head, (2) high permeability for the flow of liquid sodium to minimize internal losses, and (3) be made from a material that is exceptionally stable at high temperatures in a sodium environment. The authors have developed micromachining techniques to manufacture high performance evaporators for AMTEC cells. The evaporators have been fabricated from stainless steel, molybdenum, and a niobium alloy (Nb-1Zr). The regular, micromachined structure leads to very high capillary pumping head with high permeability for liquid flow. Data from tests performed with common fluids at room temperature characterize the capillary pumping head and permeability of these structures. Three micromachined evaporators have been built into AMTEC cells and operated at temperatures up to 1,100 K. Results from these tests confirm the excellent pumping capabilities of the micromachined evaporators.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}

Book:
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