The paper reports on the prediction of turbulent heat transfer in flows between parallel plates with wall transpiration. The elliptic blending second moment closure for turbulent stresses and the GGDH model for turbulent heat fluxes are employed to predict the turbulent flow and heat transfer. The numerical results by the adopted models are directly compared to the DNS data and the measurements to assess the performance of the model predictions. The predictions show correctly the effect of deceleration and acceleration of the flow caused by the transpiration, and the anisotropy of the turbulence structure is augmented towards downstream by the fluid injection. The turbulence structure and heat transfer characteristics of transpired flows are well captured by the present turbulence and heat flux models.

Recently, it was under an obligation to install the VOCs recycling unit in the cleaners and the gas station to prevent from discharging VOCs emitted from the cleaners and the gas station. The objectives of this study was to investigate the VOCs recycling unit used thermoelectric module to recycle the organic solvent from the cleaners and after washing. The traditional way was the use of the VOCs recycling unit with the compressor. But the recycling unit has many weak points , noise, size, danger of fire, additional pollution and so on. In order to improve these weak points, it was developed the new VOCs recycling unit using the thermoelectric module through this study. The cooling block with 32 thermoelectric module was applied to cool the hot VOCs where comes to occur from the dryer in high temperature condition. Also a water-cooled equipment was used to remove the heat from the hot surface of thermoelectric module. The experimental results from new VOCs recycling unit shows that the maximum recovery rate of the unit was 83.2 % and the recycled VOCs' purity was 98 % or more. And the noise problem was solved by applying the thermoelectic module to the VOCs recycling unit.

The present study focused on the synthesis of a bismuth-antimony-tellurium-based thermoelectric nanopowders using plasma arc discharge process. The chemical composition, phase structure, particle size of the synthesized powders under various synthesis conditions were analyzed using XRF, XRD and SEM. The powders as synthesized were sintered by the plasma activated sintering. The thermoelectric properties of sintered body were analyzed by measuring Seebeck coefficient, specific electric resistivity and thermal conductivity. The chemical composition of the synthesized Bi-Sb-Te-based powders approached that of the raw material with an increasing DC current of the are plasma. The synthesized Bi-Sb-Te-based powder consist of a mixed phase structure of the , and phases. This powder has homogeneous mixing state of two different particles in an average particle size; about 100nm and about 500nm. The figure of merit of the sintered body of the synthesized 18.75 wt.%Bi-24.68 wt.%Sb-56.57 wt.%Te nanopowder showed higher value than one of the sintered body of the mechanically milled 12.64 wt.%Bi-29.47 wt.%Sb-57.89 wt.%Te powder.

The effects of the dopant (Mn) ratio on the microstructure and thermoelectric properties of alloy were studied in this research. The alloy was fabricated by a combination process of ball milling and high pressure pressing. Structural behavior of the sintered bulks were systematically investigated by XRD, SEM, and optical microscopy. With increasing dopan (Mn) ratio, the density and phase of the sintered bulks increased and maximum density of 94% was obtained in the 0.07% Mn-doped alloy. The sintered bulks showed fine microstructure of , and phase. The semiconducting phase of was transformed from phase by annealing

In this study, the thermoelectric power and resistivity of the perovskite manganiteLa0.75Ba0.25MnO3 were investigated in the temperature range 300K-1200K. The electrical resistivity andthermoelectric power indicate a transport mechanism dominated by adiabatic small-polaron hopping. Thepower factor increases from 2×10−6W/mK2 to 1×10−5W/mK2 as to the temperature increases from 400K to1200K, which indicates that the compound is highly feasible as a thermoelectric material at high temperatures.

By Multiple-measurement method using Inverse Heat Conduction Method and parameter estimation method, thermo physical properties were measured, and its estimation accuracies were compared with other reference data. Values of the thermophysical properties determined from the measurement method are in the range of data reported in the literature. From the above, it should be pointed out that the inverse algorithm and multiple measurement method is particularly simple to code and can be run on the personal computer used for the data acquisition. Especially, the inverse algorithm for a heat flux determination can be practically used in every case where the surface measurement are not accessible and where it is impossible to correctly place some sensors with the body. It is found that the measurement method is more practical, convenient and time-saving than other steady-state methods.

P-type thermoelectric material was sintered by Hot Press process (HP) and the effect of boron ( at%) addition on the thermoelectric properties were reported. To enhance the thermoelectric performances, the , alloys were fabricated by mechanical alloying (MA) and HP. The carrier of p-type SiGe alloy was controlled by B-doping. The effect of sintering condition and thermoelectric properties were investigated. B-doped SiGe alloys exhibited positive seebeck coefficient. The electrical conductivity and thermal conductivity were increased at the small amount of boron content ( at%). However, they were decreased over 0.5 at% boron content. As a result, the small addition of boron improved the Z value. The Z value of 0.5 at% B doped B alloy was , the highest value among the prepared alloys

The present study is to analyze the thermoelectric properties of thermoelectric materials fabricated by the mechanical grinding process. The powders were prepared by the combination of mechanical milling and reduction treating methods using simply crushed pre-alloyed powder. The mechanical milling was carried out using the tumbler-ball mill and planetary ball mill. The tumbler-ball milling had an effect on the carrier mobility rather than the carrier concentration, whereas, the latter on the carrier concentration. The specific electric resistivity and Seebeck coefficient decreased with increasing the reduction-heat-treatment time. The thermal conductivity continuously increased with increasing the reduction-heat-treatment time. The figure of merit of the sintered body prepared by the mechanical grinding process showed higher value than one of the sintered body of the simply crushed powder.

The p-type semiconductor thermoelectric materials were fabricated by melting, milling and sintering process and their thermoelectric properties were characterized. The compound materials were ball-milled with milling time and the powders were sintered by spark plasma sintering process. The ball milled powders had equiaxial shape and approedmately in size. The figure of meritz of sintered thermoelectric materials decreased with milling time because of lowered electrical resistivity. The thermoelectric properties of materials have been discussed in terms of electrical property with ball mill process.