An investigation on heat transfer of granular materials in the novel flighted rotary drum

2016 ◽  
Vol 95 (2) ◽  
pp. 386-397 ◽  
Author(s):  
Muyuan Li ◽  
Xiang Ling ◽  
Hao Peng ◽  
Zhengyu Cao ◽  
Yan Wang
Keyword(s):  
Heat Transfer ◽  
Granular Materials ◽  
The Novel ◽  
Rotary Drum

Heat Transfer Experiments in a Rotary Drum for a Variety of Granular Materials

2015 ◽  
Vol 29 (4) ◽  
pp. 520-535 ◽  
Author(s):  
Aainaa Izyan Nafsun ◽  
Fabian Herz ◽  
Eckehard Specht ◽  
Viktor Scherer ◽  
Siegmar Wirtz
Keyword(s):  
Heat Transfer ◽  
Granular Materials ◽  
Rotary Drum

Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

2020 ◽  
Vol 92 (3) ◽  
pp. 30901
Author(s):  
Suvanjan Bhattacharyya ◽  
Debraj Sarkar ◽  
Ulavathi Shettar Mahabaleshwar ◽  
Manoj K. Soni ◽  
M. Mohanraj
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Thermal Performance ◽  
Working Fluid ◽  
The Novel ◽  
Heat Exchanger Tube ◽  
Heat Transfer Augmentation ◽  
Corrugated Tube ◽  
The Impact ◽  
Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

scholarly journals A rotary drum dryer for palm sterilization: preliminary study of flow and heat transfer using CFD

2018 ◽  
Vol 297 ◽  
pp. 012030
Author(s):  
S. Hanifarianty ◽  
A. Legwiriyakul ◽  
A. Alimalbari ◽  
C Nuntadusit ◽  
T. Theppaya ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flow And Heat Transfer ◽  
Rotary Drum ◽  
Preliminary Study

Analysis of fluid flow and heat transfer in the novel liquid volumetric plated cavity receiver

Solar Energy ◽  
2022 ◽  
Vol 231 ◽  
pp. 420-432
Author(s):  
Om Singh ◽  
Shireesh B. Kedare ◽  
Suneet Singh
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
The Novel ◽  
Flow And Heat Transfer

Heat Transfer Model in a Rotary Drum During the Fermentation Process

2020 ◽  
Vol 77 (1) ◽  
pp. 151-160
Author(s):  
Norazaliza Mohd Jamil ◽  
Aainaa Izyan Nafsun ◽  
Abdul Rahman Mohd Kasim
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Heat Transfer Coefficient ◽  
Fermentation Process ◽  
Transfer Model ◽  
Kutta Method ◽  
Contact Heat ◽  
Contact Heat Transfer ◽  
Runge Kutta Method ◽  
Rotary Drum

A new mathematical model describing heat transfer during the fermentation process in a rotary drum is proposed. The model includes representations of the kinetic reactions, the temperature of the solid bed, and physical structures within the rotary drum. The model is developed using five ordinary differential equations and was then solved using the Runge-Kutta method embedded in MATLAB software. A reasonable behaviour for the temperature profile to the fermentation process is achieved. The results show that the mass of the solid bed, contact heat transfer coefficient, and the wall temperature has a significant effect on the fermentation process in a rotary drum.

scholarly journals Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 981 ◽  
Author(s):  
Zexuan Wang ◽  
Kunfeng Zhao ◽  
Bei Xiao ◽  
Peng Gao ◽  
Dannong He ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
High Efficiency ◽  
Utilization Rate ◽  
The Novel ◽  
Surface Deposition ◽  
Advantages And Disadvantages ◽  
Monolithic Catalysts ◽  
Mass And Heat Transfer ◽  
Application Prospects

Monolithic catalysts have great industrial application prospects compared to powdered catalysts due to their low pressure drop, the high efficiency of mass and heat transfer, and recyclability. Deposition of active phases on the monolithic carriers dramatically increases the utilization rate and has been attracting continuous attention. In this paper, we reviewed the traditional (impregnation, coating, and spraying) and novel (hydrothermal and electrodeposition) strategies of surface deposition integration, analyzed the advantages and disadvantages of both ways, and then prospected the possible directions for future development of integration technologies.

Effective Thermal Conductivity of Submicron Powders: A Numerical Study

2016 ◽  
Vol 846 ◽  
pp. 500-505
Author(s):  
Wei Jing Dai ◽  
Yi Xiang Gan ◽  
Dorian Hanaor
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Resistance ◽  
Effective Thermal Conductivity ◽  
Granular Materials ◽  
Gas Phase ◽  
Numerical Study ◽  
Transfer Model ◽  
Size Of Particles ◽  
Contact Unit

Effective thermal conductivity is an important property of granular materials in engineering applications and industrial processes, including the blending and mixing of powders, sintering of ceramics and refractory metals, and electrochemical interactions in fuel cells and Li-ion batteries. The thermo-mechanical properties of granular materials with macroscopic particle sizes (above 1 mm) have been investigated experimentally and theoretically, but knowledge remains limited for materials consisting of micro/nanosized grains. In this work we study the effective thermal conductivity of micro/nanopowders under varying conditions of mechanical stress and gas pressure via the discrete thermal resistance method. In this proposed method, a unit cell of contact structure is regarded as one thermal resistor. Thermal transport between two contacting particles and through the gas phase (including conduction in the gas phase and heat transfer of solid-gas interfaces) are the main mechanisms. Due to the small size of particles, the gas phase is limited to a small volume and a simplified gas heat transfer model is applied considering the Knudsen number. During loading, changes in the gas volume and the contact area between particles are simulated by the finite element method. The thermal resistance of one contact unit is calculated through the combination of the heat transfer mechanisms. A simplified relationship between effective thermal conductivity and loading pressure can be obtained by integrating the contact units of the compacted powders.

Enhancement of heat transfer in a square channel by roughened surfaces in rib-elements and turbulent flow manipulation

2017 ◽  
Vol 27 (7) ◽  
pp. 1571-1595 ◽  
Author(s):  
Jian Liu ◽  
Gongnan Xie ◽  
Bengt Ake Sunden ◽  
Lei Wang ◽  
Martin Andersson
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Research Work ◽  
Flow Characteristics ◽  
High Heat ◽  
The Novel ◽  
Content Type ◽  
Flat Surfaces ◽  
Square Channel ◽  
High Heat Transfer

Purpose The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties. Design/methodology/approach The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work. Findings Based on the results, it is found that rounded transition cylindrical ribs have a large advantage over the conventional ribs in both enhancing heat transfer and reducing pressure loss penalty. In addition, cylindrical ribs increase the flow impingement at the upstream of the ribs, which will effectively increase the high heat transfer areas. The design of rounded transition cylindrical ribs and grooves will be an effective way to improve heat transfer enhancement and overall thermal performance of internal channels within blade cooling. Originality/value The novel geometries in this research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. The combination of cylindrical ribs and grooves to manipulate the turbulent flow.

Novel Turbine Endwall Contours for the Reduction of Heat Transfer Generated Using the Ice Formation Method

2012 ◽  
Author(s):  
Kristian Haase ◽  
Sven Winkler ◽  
Bernhard Weigand ◽  
Sven Olaf Neumann
Keyword(s):  
Heat Transfer ◽  
Guide Vane ◽  
Three Dimensional ◽  
Vortical Flow ◽  
Ice Formation ◽  
The Novel ◽  
Average Heat ◽  
Low Pressure Turbine ◽  
Transfer Behavior ◽  
Formation Method

Three-dimensional contouring of vane endwalls has proven to be an efficient method for reducing aerodynamic losses or, respectively, endwall heat transfer by active manipulation of the complex vortical flow structures in the vane passage. The present study shows the application of the Ice Formation Method for endwall contouring of a guide vane row with the goal of reducing endwall heat transfer. Endwall contours for the guide vane row of a low pressure turbine are experimentally generated in form of ice contours and evaluated with respect to their heat transfer behavior. A comparison with the flat plate showed that average heat transfer is considerably reduced for the ice-contoured endwalls with reductions up to 42%. The generated endwall contours were also digitized and used in numerical simulations. The latter allowed for a comparison of endwall heat transfer for the novel contours with the heat transfer for a flat, uncontoured endwall. This showed that the new endwall contours also feature decreased average heat transfer compared to the flat endwall with the maximum obtained reduction being 12%.

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