heat transfer – Page 2 – TechConnect Briefs

Enhancing Combustion and Heat Exchange Through Electrical Augmentation

Goodson D., Rutkowski R., Osler G., ClearSign Combustion Corporation, US

We have observed that software-controlled propagation of insignificant amounts of electrical energy through a flame region enhances both combustion efficiency and the transfer of thermal energy in an electrically conductive burner and heat exchange system. [...]

Investigations on the convective heat transfer in Ag – and Cu – ethylene glycol nanofluids

Dzido G., Chmiel-Kurowska K., Gierczycki A., Jarzebski A.B., Institute of Chemical Engineering, Polish Academy of Science, PL

Common coolants as water, oil or ethylene glycol are characterized by poor thermal properties, i.e. convective heat transfer and heat conductivity coefficient. Addition of solid particles with size less than 100 nm can significantly improve [...]

Comparison of Heat Transfer and Fluid Dynamic Performance of Nanofluids

Kulkarni D.P., Namburu P.K., Das D.K., University of Alaska Fairbanks, US

Many recent studies have shown that nanofluids with metallic nanoparticles as suspension increase the thermal conductivity of base fluid by a substantial amount. Research on copper oxide (CuO) nanoparticles in water has revealed that a [...]

Heat Transfer Cost-Effectiveness of Nanofluids

Xu D., Pan L., Yao Q., Institute og High Performance Computing, SG

When metal or oxide nano particles are dispersed in fluids to form nanofluids, the particles will improve the thermal conductivity of the fluids. Therefore, it is suggested to use nanofluids as coolant to improve heat-exchanger [...]

Effect of Surface Hydration and Interfusion of Suspended Silica Nanoparticles on Heat Transfer

Milanova D., Wu X., Kumar R., University of Central Florida, US

Nanofluid suspensions enhance thermal conductivity and the heat transfer. The authors have previously shown that the Critical Heat Flux (CHF) of NiChrome wire in a silica nanofluid can be increased by 200% compared to conventional [...]

Effect of Surface Hydration and Interfusion of Suspended Silica Nanoparticles on Heat Transfer

Milanova D., Wu X., Kumar R., University of Central Florida, US

Nanofluid suspensions enhance thermal conductivity and the heat transfer. The authors have previously shown that the Critical Heat Flux (CHF) of NiChrome wire in a silica nanofluid can be increased by 200% compared to conventional [...]

Computational Heat Transfer and Two-phase Flow in Miniature Tubes

Lakehal D., Narayanan C., ASCOMP, CH

We will report on our recent advances made in predicting this class of flow, using the Level Set approach, in which we have incorporated phase-change capabilities, surface tension and triple-line dynamics models based on the [...]

Heat Transfer Cost-Effectiveness of Nanofluids

Xu D., Pan L., Yao Q., Institute og High Performance Computing, SG

When metal or oxide nano particles are dispersed in fluids to form nanofluids, the particles will improve the thermal conductivity of the fluids. Therefore, it is suggested to use nanofluids as coolant to improve heat-exchanger [...]

Development of a Slug-Flow PCR Chip with Minimum Heating Cycle Times

Hardt S., Dadic D., Doffing F., Drese K.S., Münchow G., Sörensen O., Institute of Microtechnology Mainz, DE

A microfluidic PCR device is presented capable of rapid temperature ramping and handling of sample volumes in the microliter and submicroliter range. The PCR chip comprises a straight micro channel in which a sample slug [...]

Heat Transfer Macromodels for MEMS Devices with 3D Geometries

Yu C-C, Yang Y-J, National Taiwan University, TW

There are numerous heat transfer applications in MEMS, such as thermal actuating, uncooled infrared sensing, chip cooling, temperature sensing, PCR, and so on. Most of the applications need feedback loops for precise control or actuation, [...]