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Numerical Heat Transfer And Fluid Flow

Handbook Of Heat Transfer

Challenging offers of material science for adsorption heat transformation: A review

Adsorption heat transformation (AHT) is one of the challenging technical approaches for supporting the world community initiatives to alleviate or reverse the gravity of the problems arising from CO 2 emissions and global warming. The key tool for enhancement of the AHT efficiency and power is a harmonization of adsorbent properties with working conditions of the AHT cycles. It can be realized by means of target-oriented designing the adsorbent specified for a particular AHT cycle. Two-component composites ‘salt in porous matrix’ (CSPMs) offer new opportunities for nano-tailoring their sorption properties by varying the salt chemical nature and content, porous structure of the host matrix and synthesis conditions. CSPMs have been recognized as promising solid sorbents for various AHT cycles, namely adsorption chilling, desiccant cooling, heat storage and regeneration of heat and moisture in ventilation systems. In this review, we survey a current state-of-the-art and new trends in developing efficient CSPMs for various AHT cycles. Copyright , Oxford University Press.

Composites ‘salt inside porous matrix’ for adsorption heat transformation: a current state-of-the-art and new trends

Solar powered sorption cooling systems have been researched and demonstrated in recent years, which contain adsorption cooling, absorption cooling and desiccant cooling. The various typical systems with small scale for potential residential applications are discussed and analyzed, in which the working principals, system suitability for solar cooling, performance, maintenance and economic viability have been discussed in this paper. With such analyses and the available real operation systems, the detailed options and guidelines of solar cooling for residential applications are shown.

Solar sorption cooling systems for residential applications: Options and guidelines

High-low-temperature normal-pressure heat cycle test device

A numerical investigation is carried out to understand the effect of side ratio, as well as aiding/opposing buoyancy on the aerodynamic and heat transfer characteristics around a rectangular cylinder in the vertical unconfined configuration. The representative vortex structures and isotherms patterns are presented and discussed. A correlation between the critical Richardson number for the buoyancy-induced breakdown of Karman vortex street and the side ratio of the cylinder is obtained. The influence of side ratio and buoyancy on Strouhal number, drag and lift coefficient, the recirculation length, and heat transfer from the cylinder is also investigated.

Effect of Side Ratio and Aiding/Opposing Buoyancy on the Aerodynamic and Heat Transfer Characteristics around a Rectangular Cylinder at Low Reynolds Numbers

Conjugate mixed convection in the entrance region of a symmetrically heated vertical channel with thick walls

Turbulence transportation across permeable interfaces is investigated using direct numerical simulation, and the connection between the turbulent surface flow and the pore flow is explored. The porous media domain is constructed with an in-line arranged circular cylinder array. The effects of Reynolds number and porosity are also investigated by comparing cases with two Reynolds numbers (
 $$Re\approx 3000,6000$$
 ) and two porosities (
 $$\varphi =0.5,0.8$$
 ). It was found that the change of porosity leads to the variation of flow motions near the interface region, which further affect turbulence transportation below the interface. The turbulent kinetic energy (TKE) budget shows that turbulent diffusion and pressure transportation work as energy sink and source alternatively, which suggests a possible route for turbulence transferring into porous region. Further analysis on the spectral TKE budget reveals the role of modes of different wavelengths. A major finding is that mean convection not only affects the distribution of TKE in spatial space, but also in scale space. The permeability of the wall also have an major impact on the occurrence ratio between blow and suction events as well as their corresponding flow structures, which can be related to the change of the Karman constant of the mean velocity profile.

/pdf/transport-of-turbulence-across-permeable-interface-in-a-148tzjl6so.pdf

Guang Yang

Papers

High-low-temperature normal-pressure heat cycle test device

Effect of Side Ratio and Aiding/Opposing Buoyancy on the Aerodynamic and Heat Transfer Characteristics around a Rectangular Cylinder at Low Reynolds Numbers

Conjugate mixed convection in the entrance region of a symmetrically heated vertical channel with thick walls

Transport of Turbulence Across Permeable Interface in a Turbulent Channel Flow: Interface-Resolved Direct Numerical Simulation

Insights into the enhancement of CO2 adsorption on faujasite with a low Si/Al ratio: Understanding the formation sequence of adsorption complexes