...Hengyu Song; Yan Xia; Guangjie Yuan; Jingcui Li; Tianen Liu; Huaizhong Shi; Yinhong Tang This article conducted a numerical study of composite percussive drilling with consideration of heat transfer between drilling fluid and bottom-hole rock in geothermal drilling, and analyzed influences...

... eddy simulation (LES) model for Reynolds (Re) numbers from 10,000 to 50,000. A total of six different connecting holes were investigated with a smooth and dimpled surface. A partial spherical dimple with two circular holes showed the highest heat transfer, but it has a higher pressure loss penalty...

... of the airfoil. The leading edge is suitable for this type of cooling, as this area is relatively thick. Air strikes the target surface. In these methods, the coolant passes through the region of interest and increases the heat transfer coefficient. The gas turbines have a wide range of applications...

... are considered as the primary and secondary working fluids, and the twisted tape makes the flow further disturbed so that a larger overall heat transfer coefficient is obtained. The finite volume method has been applied to scrutinize the impacts of Reynolds number as well as the twisting-tape turns number...

... in the temperatures ranging from 25 to 50 °C of and the nano-particles concentrations ranging from 0.125% to 1.5% previously. The presence of nano-particles leads to intensify the pressure descent and heat transfer, simultaneously. Therefore, the second goal was to evaluate the influence of nano-particles...

... in the J ournal of E nergy R esources T echnology . 22 08 2019 15 02 2020 15 02 2020 28 02 2020 desiccant air cooling effectiveness heat transfer performance regenerative evaporative cooler energy conversion/systems energy systems analysis heat energy generation...

... simulation (LES) is utilized. Results from the numerical study show a good agreement with the experimental data. From the results, it can be concluded that increasing both Reynolds number and rotational speed is in favor of the heat transfer coefficient enhancement, especially in the turn region. Fig. 2...

... deployed. The experimental results have identified the heat input and output as the most influential aspect for both the operation and a possible scale-up of such a TCES system. The decisive parameter for the heat input and output is the heat transfer coefficient between immersed heat exchangers...

... approaches were considered for tracking the buoyancy effect on heat transfer. In the first case, the density ratio was set constant, and the rotational speed was varied. In the second case, the density ratio was changed in the stationary case, and the effect of density ratio was discussed. The range...

... and CFD–DEM models show qualitative accordance and are therefore applied for further investigations. The MFM (as a variation of the TFM) is applied in order to simulate hydrodynamics and heat transfer to immersed objects in a small-scale experimental test rig because the MFM can handle the required small...

...Bengt Sunden; Zan Wu Control of heat transfer is important in wind power systems. In cold climate, the problems of icing and de-icing of the turbine blades need to be handled by efficient heat transfer technologies. Heat-generating components like electric generator, gear box, and frequency...

... mixtures heat transfer hydrogen laminar flow organic compounds syngas velocity measurement 15 01 2011 14 06 2011 06 09 2011 06 09 2011 2011 American Society of Mechanical Engineers ...

... heat transfer parameter is kept constant as the heat exchanger allocation parameter is allowed to vary. The value of the heat exchanger allocation parameter corresponding to the maximum coefficient of performance (COP) is noted. The results are compared to those of a non-Carnot refrigerator...

...N. Hegde; I. Han; T. W. Lee; R. P. Roy Computational simulations of flow and heat transfer in heat recovery steam generators (HRSGs) of vertical- and horizontal-tube designs are reported. The main objective of the work was to obtain simple modifications of their internal configuration that render...

... was shown by comparing the experiments. Furthermore, the formula between Reynolds number and Nusselt number was obtained, which express the heat transfer around the gas hydrate lump. Equilibrium diagram of methane hydrate and HCFC141b hydrate Experimental apparatus of the measuring HCFC141b...

... refrigeration cycle, interconnected by absorption, separation, and heat transfer processes. The performance was evaluated by both energy and exergy efficiencies, with the latter providing good guidance for system improvement. The influences of the key parameters, which include the basic working solution...

.... As there are humid air and refrigerant single- and two-phase streams involved in the heat transfer process, then there are irreversibilities or exergy destruction, due to pressure losses I ̇ Δ P , due to temperature difference I ̇ Δ T and due to specific humidity gradient I ̇ Δ ω . These principal components...

.... The pressure drop at various sections and the heat transfer coefficients are computed using empirical correlations. Solutions are obtained by using SIMULINK . The model is validated by comparing its steady state and dynamic responses with the actual plant data. Open loop responses of the model to the step...

...Andreas Johansson; Filip Johnsson; Bengt-Åke Andersson High in-bed heat transfer and low corrosive environment imply that the loop seal of a circulating fluidized bed (CFB) boiler is an advantageous location for superheaters. In order to increase the knowledge on the flow pattern and the heat...

... transfer area of exchanger, m 2 F a , F b heat transfer areas of exchangers a and b , m 2 I iteration m h flow rate of the hot fluid, kg/s m c flow rate of the cold fluid, kg/s N...