Two-sided Gaussian bounds are established for the weighted heat kernels on the unit ball and simplex in Rd generated by classical differential operators whose eigenfunctions are algebraic polynomials.

Outline • Background • O bjectives and strategy • Integral thermodynamical analysis • FVM analysis: mathematical model • FVM analysis: status and outstanding tasks Background • Loop Heat Pipe: thermal control of Alpha Magnetic Spectrometer used for extra-terrestrial studies on anti-matter (see UNIBG-talk) • Bypass valve: prevent freezing of working fluid (Propylene) in liquid line by interrupti...

Three dimensional numerical investigation is carried out to study the influence of geometry on thermal behavior of flat heat pipe. Two phase mixture model has been formulated to investigate the phase change phenomena during steady state operation of flat heat pipe. In this model, single fluid approach is used and governing equations for mass, momentum and energy are discretised using finite vol...

An experimental study is realized in order to verify the Mini Heat Pipe (MHP) concept for cooling high power dissipation electronic components and determines the potential advantages of constructing mini channels as an integrated part of a flat heat pipe. A Flat Mini Heat Pipe (FMHP) prototype including a capillary structure composed of parallel rectangular microchannels is manufactured and a f...

A mathematical model predicting the oscillating motion in an oscillating heat pipe is developed. The model considers the vapor bubble as the gas spring for the oscillating motions including effects of operating temperature, non-linear vapor bulk modulus, and temperature difference between the evaporator and the condenser. Combining the oscillating motion predicted by the model, a mathematical m...

This study presents the improvement of thermal performance of heat pipe using copper nanofluid with aqueous solution of n-Butanol. The nanofluids kept in the suspension of conventional fluids have the potential of superior heat transfer capability than the conventional fluids due to their improved thermal conductivity. In this work, the copper nanofluid which has a 40 nm size with a concentrati...

Pulsating heat pipe is an efficient heat exchange device which is being used for cooling and heating recovery. In the present work, we made a closed-loop pulsating heat pipe with six U-turns and we used water in our system. Moreover the use of water-Fe3O4 nanofluid was studied with two different filling ratios 40% and 50% and 1% mass concentration. At the end we calculated heat resistance and h...

Pulsating heat pipe is an efficient heat exchange device which is being used for cooling and heating recovery. In the present work, we made a closed-loop pulsating heat pipe with six U-turns and we used water in our system. Moreover the use of water-Fe3O4 nanofluid was studied with two different filling ratios 40% and 50% and 1% mass concentration. At the end we calculated heat resistance and h...

The paper describes the work aimed at controllable loop heat pipe (CLHP) operation study when noncondensable gases (NCGs) are injected. In this work, the effect of NCG on the operating performance of an ammonia– stainless steel CLHP was experimentally investigated. Nitrogen was selected as NCG, and the steady-state operating characteristics of the CLHP with NCG was systematically studied for di...