scholarly journals Corrigenda

1961 ◽  
Vol 14 (3) ◽  
pp. 435
Keyword(s):  
Gas Discharge ◽  
Maximum Temperature ◽  
Thermoelectric Effects

The Influence of Thermoelectric Effects on the Maximum Temperature in a Radially Constricted Gas Discharge between Electrodes

scholarly journals The Influence of Thermoelectric Effects on the Maximum Temperature in a Radially Constricted Gas Discharge Between Electrodes

1961 ◽  
Vol 14 (2) ◽  
pp. 279
Author(s):  
PW Seymour
Keyword(s):  
Steady State ◽  
Heat Loss ◽  
Gas Discharge ◽  
Maximum Temperature ◽  
Thermoelectric Effects

In an earlier paper the author provided a method for estimating the maximum temperature in a steady-state, centrally constricted, highly ionized deuterium discharge between electrodes. The analysis applied to discharges not too long, so that bremsstrahlung loss could be neglected compared to the main heat loss by conduction to the electrodes, and thermoelectric effects were not included.

Thermoelectric Effects of Size of Microchannels on an Internally Cooled Li-Ion Battery Cell

2016 ◽  
Author(s):  
Shahabeddin K. Mohammadian ◽  
Yuwen Zhang
Keyword(s):  
Cell Voltage ◽  
Maximum Temperature ◽  
Width Ratio ◽  
Inlet Temperature ◽  
Temperature Uniformity ◽  
Thermoelectric Effects ◽  
Electrolyte Flow ◽  
Battery Cell ◽  
Internally Cooled ◽  
Li Ion

Thermoelectric effects of size of microchannels on an internally cooled Li-ion battery cell is investigated in this paper. The liquid electrolyte was flowed as the coolant through rectangular microchannels embedded in the positive and negative electrodes. The effects of size of microchannels on the thermal and electrical performances of a Li-ion (Lithium-ion) battery cell were studied by carrying out 3D transient thermal analysis. Six different cases were designed according to the ratio of the width of the microchannels to the width of the cell from 0 to 0.5. The effects of inlet velocity of electrolyte flow, inlet temperature of electrolyte flow, and size of the microchannels were studied on the temperature uniformity inside the battery cell, maximum temperature inside the battery cell, and cell voltage. The results showed that increasing the size of the microchannels enhances the thermal performance of the battery cell; however, it causes slight decrease on the cell voltage (less than 2%). Comparison between the case with width ratio of 0.5 (Case 6) with the case without microchannel (Case 1) showed that this internal cooling method can decrease the maximum temperature of the battery up to 11.22K, 9.36K, and 7.86K for the inlet temperature of electrolyte flow of 288.15K, 298.15K, and 308.15K, respectively. Furthermore, the case with width ratio of 0.5 (Case 6) has up to 77% better temperature uniformity compare with the case with width ratio of 0.1 (Case 2). Increasing the inlet temperature of electrolyte flow enhances the temperature uniformity up to 33% and increases the cell voltage up to 3%, but it keeps the battery on higher temperatures. Furthermore, increasing the inlet velocity of electrolyte flow from 0.01m/s to 0.01m/s enhances the thermal management of the battery cell by decreasing the temperature inside the battery up to 8.09K, 6.75K, and 5.67K for the inlet temperature of electrolyte flow of 288.15K, 298.15K, and 308.15K respectively. Furthermore, it improves the temperature uniformity up to 89% and decreases the voltage less than 1%.

Computational Modeling of Transverse Peltier Coolers

2013 ◽  
Author(s):  
Syed Ashraf Ali ◽  
Sandip Mazumder
Keyword(s):  
Cross Section ◽  
Thermoelectric Material ◽  
Computational Study ◽  
Operating Conditions ◽  
Maximum Temperature ◽  
Design Parameters ◽  
Thermoelectric Effect ◽  
Thermoelectric Effects ◽  
Transport Cross Section ◽  
Transverse Thermoelectric Effect

Transverse thermoelectric effect can be produced artificially by stacking at an angle layers of a thermoelectric material with another material that may or may not be a thermoelectric material. In this exploratory computational study, a new metamaterial, comprised of tilted alternating layers of an n-type thermoelectric alloy and a metal, is investigated to gain an understanding of how much cooling can be produced by transverse thermoelectric effect and the conditions under which maximum cooling is attainable. The governing conservation equations of energy and electric current, with the inclusion of thermoelectric effects, are solved on an unstructured mesh using the finite-volume method to simulate a transverse Peltier cooler under various operating conditions. First, the code is validated against experimental data for a n-Bi2Te3-Pb metamaterial, and subsequently explored. It is found that intermediate applied currents produce maximum temperature depression (ΔT). Optimum values of the geometric design parameters such as tilt angle and device aspect ratio are also established through parametric studies. Finally, it is shown that the ΔT can be amplified by constricting the phonon (heat) transport cross-section while keeping the electron (current) transport cross-section unchanged — a strategy that cannot be employed in conventional thermoelectric devices where electrons and phonons follow the same path. This makes transverse Peltier coolers particularly attractive for generating large ΔT without multi-stage cascading.

Thermo-Electro-Mechanical Refrigeration Based on Transient Thermoelectric Effects

1999 ◽  
Author(s):  
Andrew Miner ◽  
Arun Majumdar ◽  
Uttam Ghoshal
Keyword(s):  
Heat Flux ◽  
Figure Of Merit ◽  
Temperature Drop ◽  
Maximum Temperature ◽  
Pulsed Current ◽  
Thermoelectric Cooler ◽  
Thermoelectric Effects ◽  
Mechanical Element ◽  
Intermittent Contact ◽  
A Tec

Abstract This paper introduces the concept of a thermo-electro-mechanical cooler (TEMC), which modifies a traditional thermoelectric cooler (TEC) by using intermittent contact of a mechanical element synchronized with an applied pulsed current. Using Bi2Te3 as the thermoelectric material, it is predicted that the maximum temperature drop across a TEMC may be as much as 35 percent higher than that of a TEC in low heat flux applications. This effectively increases the figure of merit by a factor of 1.8.

scholarly journals Estimation of the Maximum Temperature in a Radially Constricted Gas Discharge Between Electrodes

1961 ◽  
Vol 14 (1) ◽  
pp. 129
Author(s):  
PW Seymour
Keyword(s):  
Heat Conduction ◽  
Steady State ◽  
Free Boundary ◽  
Cross Section ◽  
Discharge Tube ◽  
Boundary Surface ◽  
Gas Discharge ◽  
Maximum Temperature ◽  
Main Question ◽  
The Cross

A steady-state deuterium discharge between two electrodes is considered and the free boundary surface of the plasma is assumed thermally insulated when pinched away from the walls of the discharge tube. Cooling is therefore by heat conduction to the electrodes, compared to which bremsstrahlung loss is shown to be negligible if the discharge is not too long. The main question examined is how much the maximum temperature T m can be raised by constricting the cross section of the discharge near the centre.

Photoelectrical Properties of Semiconductor in Contact with Gas Discharge Plasma

1997 ◽  
Vol 7 (5) ◽  
pp. 1039-1044
Author(s):  
N. N. Lebedeva ◽  
V. I. Orbukh ◽  
B. G. Salamov ◽  
M. Özer ◽  
K. Çolakoǧlu ◽  
...  
Keyword(s):  
Discharge Plasma ◽  
Gas Discharge ◽  
Gas Discharge Plasma ◽  
Photoelectrical Properties

A Stable Discharge Glow in Gas Discharge System with Semiconducting Cathode

1997 ◽  
Vol 7 (4) ◽  
pp. 927-936 ◽  
Author(s):  
B. G. Salamov ◽  
K. Çolakoǧlu ◽  
Ş. Altındal ◽  
M. Özer
Keyword(s):  
Gas Discharge ◽  
Discharge System

HOLOGRAPHIC TIME-DIFFERENTIAL CINE-IMERFEROMETRY OF THE GAS DISCHARGE PLASMA

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-873-C7-874
Author(s):  
Yu. I. Filenko ◽  
B. M. Stepanov ◽  
L. S. Ushakov
Keyword(s):  
Discharge Plasma ◽  
Gas Discharge ◽  
Gas Discharge Plasma ◽  
Time Differential

ON THE THERMODYNAMICAL STABILITY OF THE PLASMA OF GAS DISCHARGE IN THE REAL GAS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-677-C7-678
Author(s):  
S. W. Temko ◽  
K. W. Temko ◽  
S. K. Kuzmin
Keyword(s):  
Gas Discharge ◽  
Real Gas ◽  
The Real
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