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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 199 records · Page 11
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

High flux boiling heat transfer enhancement using triangle shaped vertical walls in two-phase microchannel heat exchangers

Two-phase heat exchangers allow heat loads to be dissipated with lower fluid flow rates without inducing thermal gradients, and high surface area microchannels further reduce the thermal resistance of these heat exchangers. However, there are many practical limits that prevent widespread use of two-phase microchannel heat exchangers. Many authors have looked to address these practical limits by treating the channel floors or creating artificial nucleation sites. Few works look to enhance heat transfer in the walls of channels with hydraulic diameters below 200 μm. This work is aimed at increasing the efficacy of high aspect ratio silicon microchannels that use R134a as the working fluid. The 125 parallel channels are 40 μm wide, 200 μm deep, and 2 mm long and contain a 15 μm wide, 150 μm long restriction at each inlet. The thermal resistance and dryout characteristics of traditional, plain-walled channels are compared to channels with 2 area enhancement patterns each of which increases the area available for heat transfer by 41%. Furthermore, a resistance to dryout is seen in both area-enhanced test sections, and a 15.5% reduction in thermal resistance is shown for the area-enhanced part with a 6 μm triangular pitch. Only a 7.8% performance increase is seen in the test section with a 3 μm pitch. Both area enhancement patterns induce an average 27% increase in pressure drop for all tests. Heat transfer characteristics are solved for using a finite element analysis (FEA) model. By examining heat transfer coefficients and local heat fluxes, it is postulated that the area enhancement reduces heat transfer coefficients and the performance increase is caused by increasing the number of active nucleation sites.

42 ENGINEERING↗
DOE OSTI2020

Materials Data on CeCdAsO by Materials Project

CeOCdAs is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ce3+ is bonded in a 4-coordinate geometry to four equivalent As3- and four equivalent O2- atoms. All Ce–As bond lengths are 3.34 Å. All Ce–O bond lengths are 2.38 Å. Cd2+ is bonded to four equivalent As3- atoms to form a mixture of distorted edge and corner-sharing CdAs4 tetrahedra. All Cd–As bond lengths are 2.81 Å. As3- is bonded in a 8-coordinate geometry to four equivalent Ce3+ and four equivalent Cd2+ atoms. O2- is bonded to four equivalent Ce3+ atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(PIr)2 by Materials Project

BaIr2P2 is Parent of FeAs superconductors-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba is bonded in a body-centered cubic geometry to eight equivalent P atoms. All Ba–P bond lengths are 3.40 Å. Ir is bonded to four equivalent P atoms to form a mixture of distorted edge and corner-sharing IrP4 tetrahedra. All Ir–P bond lengths are 2.38 Å. P is bonded in a 8-coordinate geometry to four equivalent Ba and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrCuSF by Materials Project

SrCuFS is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Sr2+ is bonded in a 4-coordinate geometry to four equivalent S2- and four equivalent F1- atoms. All Sr–S bond lengths are 3.17 Å. All Sr–F bond lengths are 2.48 Å. Cu1+ is bonded to four equivalent S2- atoms to form a mixture of corner and edge-sharing CuS4 tetrahedra. All Cu–S bond lengths are 2.43 Å. S2- is bonded in a 4-coordinate geometry to four equivalent Sr2+ and four equivalent Cu1+ atoms. F1- is bonded to four equivalent Sr2+ atoms to form a mixture of corner and edge-sharing FSr4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaZnSbO by Materials Project

LaOZnSb is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. La3+ is bonded in a 4-coordinate geometry to four equivalent Sb3- and four equivalent O2- atoms. All La–Sb bond lengths are 3.57 Å. All La–O bond lengths are 2.42 Å. Zn2+ is bonded to four equivalent Sb3- atoms to form a mixture of edge and corner-sharing ZnSb4 tetrahedra. All Zn–Sb bond lengths are 2.75 Å. Sb3- is bonded in a 8-coordinate geometry to four equivalent La3+ and four equivalent Zn2+ atoms. O2- is bonded to four equivalent La3+ atoms to form a mixture of distorted edge and corner-sharing OLa4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdZnSbO by Materials Project

NdOZnSb is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Nd3+ is bonded in a 4-coordinate geometry to four equivalent Sb3- and four equivalent O2- atoms. All Nd–Sb bond lengths are 3.54 Å. All Nd–O bond lengths are 2.38 Å. Zn2+ is bonded to four equivalent Sb3- atoms to form a mixture of edge and corner-sharing ZnSb4 tetrahedra. All Zn–Sb bond lengths are 2.74 Å. Sb3- is bonded in a 8-coordinate geometry to four equivalent Nd3+ and four equivalent Zn2+ atoms. O2- is bonded to four equivalent Nd3+ atoms to form a mixture of distorted edge and corner-sharing ONd4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TbZnSn2 by Materials Project

TbZnSn2 is Parent of FeAs superconductors-derived structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Tb is bonded to four equivalent Zn and eight Sn atoms to form a mixture of face, edge, and corner-sharing TbZn4Sn8 cuboctahedra. All Tb–Zn bond lengths are 3.28 Å. There are four shorter (3.16 Å) and four longer (3.32 Å) Tb–Sn bond lengths. Zn is bonded in a 12-coordinate geometry to four equivalent Tb and four equivalent Sn atoms. All Zn–Sn bond lengths are 2.85 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 8-coordinate geometry to four equivalent Tb and four equivalent Zn atoms. In the second Sn site, Sn is bonded in a 8-coordinate geometry to four equivalent Tb and four equivalent Sn atoms. All Sn–Sn bond lengths are 3.10 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaCuTeF by Materials Project

BaCuTeF is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ba2+ is bonded in a 4-coordinate geometry to four equivalent Te2- and four equivalent F1- atoms. All Ba–Te bond lengths are 3.59 Å. All Ba–F bond lengths are 2.69 Å. Cu1+ is bonded to four equivalent Te2- atoms to form a mixture of corner and edge-sharing CuTe4 tetrahedra. All Cu–Te bond lengths are 2.69 Å. Te2- is bonded in a 12-coordinate geometry to four equivalent Ba2+ and four equivalent Cu1+ atoms. F1- is bonded to four equivalent Ba2+ atoms to form a mixture of corner and edge-sharing FBa4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuCuTeF by Materials Project

EuCuTeF is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Eu2+ is bonded in a 4-coordinate geometry to four equivalent Te2- and four equivalent F1- atoms. All Eu–Te bond lengths are 3.37 Å. All Eu–F bond lengths are 2.54 Å. Cu1+ is bonded to four equivalent Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent CuTe4 tetrahedra, corners with twelve equivalent FEu4Te4 tetrahedra, edges with two equivalent FEu4Te4 tetrahedra, and edges with four equivalent CuTe4 tetrahedra. All Cu–Te bond lengths are 2.67 Å. Te2- is bonded in a 12-coordinate geometry to four equivalent Eu2+, four equivalent Cu1+, and four equivalent F1- atoms. All Te–F bond lengths are 3.64 Å. F1- is bonded to four equivalent Eu2+ and four equivalent Te2- atoms to form FEu4Te4 tetrahedra that share corners with twelve equivalent CuTe4 tetrahedra, edges with two equivalent CuTe4 tetrahedra, edges with four equivalent FEu4Te4 tetrahedra, and faces with four equivalent FEu4Te4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaAgTeF by Materials Project

BaAgTeF is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ba2+ is bonded in a 4-coordinate geometry to four equivalent Te2- and four equivalent F1- atoms. All Ba–Te bond lengths are 3.64 Å. All Ba–F bond lengths are 2.71 Å. Ag1+ is bonded to four equivalent Te2- atoms to form distorted AgTe4 tetrahedra that share corners with four equivalent AgTe4 tetrahedra, corners with twelve equivalent FBa4Te4 tetrahedra, edges with two equivalent FBa4Te4 tetrahedra, and edges with four equivalent AgTe4 tetrahedra. All Ag–Te bond lengths are 2.92 Å. Te2- is bonded in a 12-coordinate geometry to four equivalent Ba2+, four equivalent Ag1+, and four equivalent F1- atoms. All Te–F bond lengths are 3.87 Å. F1- is bonded to four equivalent Ba2+ and four equivalent Te2- atoms to form FBa4Te4 tetrahedra that share corners with twelve equivalent AgTe4 tetrahedra, edges with two equivalent AgTe4 tetrahedra, edges with four equivalent FBa4Te4 tetrahedra, and faces with four equivalent FBa4Te4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2CuGe4 by Materials Project

CuGe4Hf2 is Parent of FeAs superconductors-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded to four equivalent Cu and eight Ge atoms to form distorted HfCu4Ge8 cuboctahedra that share corners with four equivalent HfCu4Ge8 cuboctahedra, edges with four equivalent HfCu4Ge8 cuboctahedra, edges with eight equivalent CuHf4Cu4Ge4 cuboctahedra, faces with four equivalent HfCu4Ge8 cuboctahedra, and faces with four equivalent CuHf4Cu4Ge4 cuboctahedra. There are two shorter (3.05 Å) and two longer (3.07 Å) Hf–Cu bond lengths. There are four shorter (2.80 Å) and four longer (2.87 Å) Hf–Ge bond lengths. In the second Hf site, Hf is bonded in a 10-coordinate geometry to ten Ge atoms. There are a spread of Hf–Ge bond distances ranging from 2.77–3.14 Å. Cu is bonded to four equivalent Hf, four equivalent Cu, and four equivalent Ge atoms to form distorted CuHf4Cu4Ge4 cuboctahedra that share corners with four equivalent CuHf4Cu4Ge4 cuboctahedra, edges with eight equivalent HfCu4Ge8 cuboctahedra, faces with four equivalent HfCu4Ge8 cuboctahedra, and faces with eight equivalent CuHf4Cu4Ge4 cuboctahedra. All Cu–Cu bond lengths are 2.69 Å. There are two shorter (2.49 Å) and two longer (2.50 Å) Cu–Ge bond lengths. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to four Hf and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.69 Å. In the second Ge site, Ge is bonded in a 8-coordinate geometry to four equivalent Hf and four equivalent Cu atoms. In the third Ge site, Ge is bonded in a 4-coordinate geometry to six equivalent Hf and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.65 Å. In the fourth Ge site, Ge is bonded in a 8-coordinate geometry to four Hf and four equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr2CuGe4 by Materials Project

Zr2CuGe4 is Parent of FeAs superconductors-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded to four equivalent Cu and eight Ge atoms to form distorted ZrCu4Ge8 cuboctahedra that share corners with four equivalent ZrCu4Ge8 cuboctahedra, edges with four equivalent ZrCu4Ge8 cuboctahedra, edges with eight equivalent CuZr4Cu4Ge4 cuboctahedra, faces with four equivalent ZrCu4Ge8 cuboctahedra, and faces with four equivalent CuZr4Cu4Ge4 cuboctahedra. There are two shorter (3.09 Å) and two longer (3.10 Å) Zr–Cu bond lengths. There are four shorter (2.83 Å) and four longer (2.89 Å) Zr–Ge bond lengths. In the second Zr site, Zr is bonded in a 10-coordinate geometry to ten Ge atoms. There are a spread of Zr–Ge bond distances ranging from 2.79–3.15 Å. Cu is bonded to four equivalent Zr, four equivalent Cu, and four equivalent Ge atoms to form distorted CuZr4Cu4Ge4 cuboctahedra that share corners with four equivalent CuZr4Cu4Ge4 cuboctahedra, edges with eight equivalent ZrCu4Ge8 cuboctahedra, faces with four equivalent ZrCu4Ge8 cuboctahedra, and faces with eight equivalent CuZr4Cu4Ge4 cuboctahedra. All Cu–Cu bond lengths are 2.70 Å. All Cu–Ge bond lengths are 2.49 Å. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to four Zr and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.70 Å. In the second Ge site, Ge is bonded in a 8-coordinate geometry to four equivalent Zr and four equivalent Cu atoms. In the third Ge site, Ge is bonded in a 4-coordinate geometry to six equivalent Zr and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.64 Å. In the fourth Ge site, Ge is bonded in a 8-coordinate geometry to four Zr and four equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaMnSbO by Materials Project

LaMnSbO is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. La3+ is bonded in a 4-coordinate geometry to four equivalent Sb3- and four equivalent O2- atoms. All La–Sb bond lengths are 3.61 Å. All La–O bond lengths are 2.43 Å. Mn2+ is bonded to four equivalent Sb3- atoms to form a mixture of edge and corner-sharing MnSb4 tetrahedra. All Mn–Sb bond lengths are 2.84 Å. Sb3- is bonded in a 8-coordinate geometry to four equivalent La3+ and four equivalent Mn2+ atoms. O2- is bonded to four equivalent La3+ atoms to form a mixture of distorted edge and corner-sharing OLa4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdMnSbO by Materials Project

NdMnSbO is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Nd3+ is bonded in a 4-coordinate geometry to four equivalent Sb3- and four equivalent O2- atoms. All Nd–Sb bond lengths are 3.57 Å. All Nd–O bond lengths are 2.39 Å. Mn2+ is bonded to four equivalent Sb3- atoms to form a mixture of edge and corner-sharing MnSb4 tetrahedra. All Mn–Sb bond lengths are 2.83 Å. Sb3- is bonded in a 8-coordinate geometry to four equivalent Nd3+ and four equivalent Mn2+ atoms. O2- is bonded to four equivalent Nd3+ atoms to form a mixture of distorted edge and corner-sharing ONd4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaCoPO by Materials Project

LaCoPO is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one CoP sheet oriented in the (0, 0, 1) direction and one LaO sheet oriented in the (0, 0, 1) direction. In the CoP sheet, Co2+ is bonded to four equivalent P3- atoms to form a mixture of distorted edge and corner-sharing CoP4 tetrahedra. All Co–P bond lengths are 2.22 Å. P3- is bonded in a 4-coordinate geometry to four equivalent Co2+ atoms. In the LaO sheet, La3+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. All La–O bond lengths are 2.36 Å. O2- is bonded to four equivalent La3+ atoms to form a mixture of edge and corner-sharing OLa4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCuSi2 by Materials Project

ZrCuSi2 is Parent of FeAs superconductors-derived structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Zr is bonded to four equivalent Cu and eight Si atoms to form distorted ZrCu4Si8 cuboctahedra that share corners with four equivalent ZrCu4Si8 cuboctahedra, edges with eight equivalent ZrCu4Si8 cuboctahedra, edges with eight equivalent CuZr4Cu4Si4 cuboctahedra, faces with four equivalent ZrCu4Si8 cuboctahedra, and faces with four equivalent CuZr4Cu4Si4 cuboctahedra. All Zr–Cu bond lengths are 3.04 Å. There are four shorter (2.76 Å) and four longer (2.82 Å) Zr–Si bond lengths. Cu is bonded to four equivalent Zr, four equivalent Cu, and four equivalent Si atoms to form CuZr4Cu4Si4 cuboctahedra that share corners with four equivalent CuZr4Cu4Si4 cuboctahedra, edges with eight equivalent ZrCu4Si8 cuboctahedra, faces with four equivalent ZrCu4Si8 cuboctahedra, and faces with eight equivalent CuZr4Cu4Si4 cuboctahedra. All Cu–Cu bond lengths are 2.62 Å. All Cu–Si bond lengths are 2.42 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to four equivalent Zr and four equivalent Cu atoms. In the second Si site, Si is bonded in a 8-coordinate geometry to four equivalent Zr and four equivalent Si atoms. All Si–Si bond lengths are 2.62 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UCuPO by Materials Project

UCuPO is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. U4+ is bonded in a 4-coordinate geometry to four equivalent P3- and four equivalent O2- atoms. All U–P bond lengths are 2.96 Å. All U–O bond lengths are 2.31 Å. Cu1+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing CuP4 tetrahedra. All Cu–P bond lengths are 2.38 Å. P3- is bonded in a 8-coordinate geometry to four equivalent U4+ and four equivalent Cu1+ atoms. O2- is bonded to four equivalent U4+ atoms to form a mixture of edge and corner-sharing OU4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCuSiP by Materials Project

ZrCuSiP is Parent of FeAs superconductors structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Zr4+ is bonded in a 8-coordinate geometry to four equivalent Si4- and four equivalent P1- atoms. All Zr–Si bond lengths are 2.82 Å. All Zr–P bond lengths are 2.71 Å. Cu1+ is bonded to four equivalent P1- atoms to form a mixture of distorted corner and edge-sharing CuP4 tetrahedra. All Cu–P bond lengths are 2.43 Å. Si4- is bonded to four equivalent Zr4+ and four equivalent Si4- atoms to form a mixture of distorted corner, edge, and face-sharing SiZr4Si4 hexagonal bipyramids. All Si–Si bond lengths are 2.54 Å. P1- is bonded in a 8-coordinate geometry to four equivalent Zr4+ and four equivalent Cu1+ atoms.

36 MATERIALS SCIENCE↗