Experimental Study on Using Solar to Improve Producing Methane in Northeast China

2014 ◽  
Vol 953-954 ◽  
pp. 132-135 ◽  
Author(s):  
Bai Li ◽  
Xue Zhi Zhou ◽  
Wang Yan
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Northeast China ◽  
Biogas Production ◽  
Solar Heating ◽  
Safe Operation ◽  
Northeast Of China

It presents a new idea of producing methane with solar heating. In order to improve the temperature and promote production of methane, providing the run situation of solar digesters on every stage with the heat-transfer content and the temperature of digesters is shown in this article. It indicates that in this experimental study, according to processing and analysis the experimental data, it’s beneficial to improve the rates of biogas production, and it solve the problem of digester and safe operation in winter in the northeast of China.

Study on Analytical Method for Thermal and Flow Field of a Turbocharger With the Catalyst Unit

2019 ◽  
Author(s):  
Tsuyoshi Kitamura ◽  
Seiichi Ibaraki ◽  
Yuichi Kihara ◽  
Toru Hoshi ◽  
Motoki Ebisu
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Flow Field ◽  
Thermal Management ◽  
Analytical Method ◽  
Conjugate Heat Transfer ◽  
Downstream Side ◽  
Mutual Dependence ◽  
Start Up

Abstract The analytical and experimental study on thermal and flow field of a turbocharger with the catalyst unit has been conducted for the thermal management at the downstream side of turbochargers, which have crucial effects on activation of catalyst units. CHT (Conjugate Heat Transfer) calculations, working for simulating heat transfer with mutual dependence between solid structures and fluid, are applied to the turbocharger including the turbine section, the bearing housing and the catalyst unit to acquire the whole of thermal and flow field accurately. The modeling for catalyst element has also been developed. In addition, the gas stand test demonstrated turbochargers under cold start-up condition to validate CHT calculations. Analytical results are evaluated against experimental data. Eventually, the proposed analytical method has been proved to have the advantage of designing for heating catalyst units.

Experimental Study of Spring Wire Enhancement of Air Heat Transfer inside TIEC Tubes

2012 ◽  
Vol 446-449 ◽  
pp. 2884-2887
Author(s):  
Yu Gang Wang ◽  
Jia Ping Liu ◽  
Huang Xiang ◽  
Shao Hui Yang
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Regression Analysis ◽  
Heat Transfer Enhancement ◽  
Flow Resistance ◽  
Transfer Enhancement ◽  
Spring Wire ◽  
Experimental Correlation ◽  
Performance Of Heat Transfer

This paper proposes the method of the fresh air heat transfer enhancement through insert Spiral in the tube of TIEC, and researches the heat transfer enhancement and Flow resistance characteristics through experiment when the Re is 6270 - 11016 range. Through regression analysis of the experimental data, obtained the experimental correlation of the heat transfer and drag coefficient of the strengthen tube, at the same time, evaluate the performance of heat transfer enhancement using appropriate method, and give some exploratory analysis.

Nucleate Boiling Heat Transfer in Spray Cooling

1996 ◽  
Vol 118 (3) ◽  
pp. 668-671 ◽  
Author(s):  
J. Yang ◽  
L. C. Chow ◽  
M. R. Pais
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Boiling Heat Transfer ◽  
Gas Flow ◽  
Nucleate Boiling ◽  
Spray Cooling ◽  
Droplet Impingement ◽  
Impingement Cooling ◽  
Nucleate Boiling Heat Transfer

An experimental study to determine the effect of liquid and secondary gas flow in droplet impingement cooling is presented. The nucleate boiling regime in particular is analyzed. A correlation to predict the Nusselt number based on the liquid film thickness is derived and compared with the experimental data.

Numerical and experimental study of heat transfer in gas-solid flow: Particle cooling

2012 ◽  
Vol 3 (1) ◽  
pp. 21-29
Author(s):  
S. M. El-Behery ◽  
W. A. El-Askary ◽  
M. H. Hamed ◽  
K. A. Ibrahim
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
High Speed ◽  
Solid Phase ◽  
Ideal Gas ◽  
Particle Rotation ◽  
Two Phase ◽  
Solid Flow ◽  
Speed Flow

Abstract Heat transfer in gas-solid two-phase flow is investigated numerically and experimentally. The numerical computations are carried out using four-way coupling Eulerian-Lagrangian approach. The effects of particle rotation and lift forces are included in the model. The gas-phase turbulence is modeled via low Reynolds number k-ε turbulence models. The SIMPLE algorithm is extended to take the effect of compressibility into account. The experimental study is performed using crushed limestone to simulate the solid phase. The effects of Reynolds numbers, particles size and temperature on the pressure drop and the temperature of the phases are investigated. The model predictions are found to be in a good agreement with available experimental data for high speed gas-solid flow and present experimental data for low speed flow. The present results indicate that heat transfer in gas solid flow can be modeled using ideal gas incompressible flow model at low conveying speed, while for high speed flow, a full compressible model should be used.

scholarly journals Experimental study of forced convection heat transport in porous media

2017 ◽  
Author(s):  
Nicola Pastore ◽  
Claudia Cherubini ◽  
Dimitra Rapti ◽  
Concetta I. Giasi
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Porous Medium ◽  
Porous Media ◽  
Heat Transport ◽  
Forced Convection ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Forced Convection Heat Transfer

Abstract. The knowledge of the dynamics of forced convection heat transfer in porous media is relevant in order to optimize the efficiency of geothermal installations in aquifers. In some applications groundwater is used directly as thermal fluid. The system uses one or several drilling holes to pump and deliver groundwater with a heat exchange system at surface (open loop). Other applications use vertical borehole heat exchangers without injection or extraction of groundwater (closed loop). In both systems the convection flow dynamics in porous media play an important role on the heat production. The present study is aimed at extending this thematic issue through heat transport experiments and their interpretation at laboratory scale. An experimental study to evaluate the dynamics of forced convection heat transfer in a thermally isolated column filled with porous medium has been carried out. The behavior of two porous media having different grain sizes and specific surfaces has been observed. The experimental data have been compared with an analytical solution for one dimensional heat transport for local non thermal equilibrium condition. The interpretation of the experimental data shows that, the heterogeneity of the porous medium affects heat transport dynamics causing a channeling effect which has consequences on thermal dispersion phenomena and heat transfer between fluid and solid phases limiting the capacity to store or dissipate heat in the porous medium.

Convection Heat Transfer From Broad Leaves of Plants

1968 ◽  
Vol 90 (1) ◽  
pp. 71-76 ◽  
Author(s):  
D. F. Parkhurst ◽  
P. R. Duncan ◽  
D. M. Gates ◽  
F. Kreith
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Gravitational Force ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Leaf Position ◽  
Empirical Relations ◽  
Different Types ◽  
Free And Forced Convection

This article presents the results of an experimental study designed to determine quantitatively the rates of heat transfer by convection from broad leaves of various plants and trees under conditions approximating those in an ecosystem in nature. Empirical relations, applicable to the different types of leaf shapes found in nature, are derived from the experimental data for free and forced convection. The influences of leaf position relative to the wind or the direction of the gravitational force field, the presence of other branches or leaves in the vicinity, and the flutter in the wind also have been investigated.

scholarly journals Experimental study on heat transfer characteristics of a modified two-phase closed thermosyphon

2017 ◽  
Vol 21 (6 Part A) ◽  
pp. 2481-2489 ◽  
Author(s):  
Babak Aghel ◽  
Masoud Rahimi ◽  
Saeed Almasi
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Thermal Resistance ◽  
Thermal Performance ◽  
Working Fluid ◽  
Heat Transfer Characteristics ◽  
Two Phase ◽  
Transfer Characteristics ◽  
Adiabatic Section

This study investigated the heat transfer characteristics of modified two-phase closed thermosyphon (TPCT) using water as the working fluid. In the modified TPCT, to reduce thermal resistance, a small TPCT was inserted inside the adiabatic section. For both the plain and modified thermosyphons the performances were determined at various heat inputs from 71-960 W. The results showed that the modified TPCT had less temperature difference between the evaporator and condenser sections than the plain one. According to the experimental data, in the modified TPCT, the thermal performance increased up to 20% over that of the unmodified one.

Computational fluid dynamics and experimental study of turbulent natural convection with surface thermal radiation in a cubic enclosure

2020 ◽  
Vol 31 (05) ◽  
pp. 2050065
Author(s):  
J. M. A. Navarro ◽  
J. F. Hinojosa ◽  
I. Hernández-López
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Experimental Data ◽  
Experimental Study ◽  
Computational Fluid Dynamics ◽  
Natural Convection ◽  
Thermal Radiation ◽  
Turbulence Models ◽  
Numerical Results ◽  
Turbulent Natural Convection

This paper reports a computational fluid dynamics and experimental study to analyze the effect of surface thermal radiation on the turbulent natural convection in a closed cubic cavity. Experimental and numerical results are compared for low and high wall emissivities. Experimental temperature profiles were obtained at six different depths and heights consisting of 14 thermocouples each. Several turbulence models were evaluated against experimental data. It was found that renormalized [Formula: see text]-[Formula: see text] and standard [Formula: see text]-[Formula: see text] turbulence models present the best agreement with the experimental data for emissivities of walls of 0.98 and 0.03, respectively. Thus, the numerical results of temperature fields and flow patterns were obtained with these models. From the results, it was found that the effect of thermal radiation on experimental heat transfer coefficients is significantly, increased between 48.7% ([Formula: see text]) and 50.16% ([Formula: see text]), when the emissivity of the walls increases from 0.03 to 0.98. Therefore, the radiative exchange should not be neglected in heat transfer calculations in cubic enclosures, even if the temperature difference between heated wall and cold wall is relatively small (between 15 and 30[Formula: see text]K).

Investigation of Duration-Dependent Multifactoring During Boiling on Down-Facing Heating Surface

2010 ◽  
Author(s):  
Irakli G. Shekriladze ◽  
Giorgi I. Gigineishvili ◽  
Jondo G. Rusishvili ◽  
David I. Shekriladze
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Boiling Heat Transfer ◽  
Heating Surface ◽  
Effective Radius ◽  
Bulk Liquid ◽  
Significant Prolongation ◽  
Number Of Factors ◽  
Nucleation Sites

A model of the “theatre of director” (MTD) links dependence of developed boiling HTC only on two external parameters (heat flux and average effective radius of active nucleation sites) to short duration of each action of cooling mechanisms. According multifactoring concept (MFC) significant prolongation of the actions of cooling mechanisms leads to transition to specific regimes with dependence on increased number of factors (duration-dependent multifactoring (DDM)). Splitting of developed boiling heat transfer curve into several curves, depending on sublooling of bulk liquid, direction of gravity field and thermal parameters of heating surface, has been fixed through experimental study of DDM of pool boiling heat transfer on downward-facing horizontal heating surface. Interpretation and qualitative analysis of received experimental data on HTC and video-films of characteristic boiling regimes allow to arriving at the conclusion about applicability of unified consistent research framework MTD-MFC in terms of description of diversity of boiling heat transfer curves.

scholarly journals Experimental study of forced convection heat transport in porous media

2018 ◽  
Vol 25 (2) ◽  
pp. 279-290 ◽  
Author(s):  
Nicola Pastore ◽  
Claudia Cherubini ◽  
Dimitra Rapti ◽  
Concetta I. Giasi
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Porous Medium ◽  
Porous Media ◽  
Heat Transport ◽  
Forced Convection ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Transport Dynamics

Abstract. The present study is aimed at extending this thematic issue through heat transport experiments and their interpretation at laboratory scale. An experimental study to evaluate the dynamics of forced convection heat transfer in a thermally isolated column filled with porous medium has been carried out. The behavior of two porous media with different grain sizes and specific surfaces has been observed. The experimental data have been compared with an analytical solution for one-dimensional heat transport for local nonthermal equilibrium condition. The interpretation of the experimental data shows that the heterogeneity of the porous medium affects heat transport dynamics, causing a channeling effect which has consequences on thermal dispersion phenomena and heat transfer between fluid and solid phases, limiting the capacity to store or dissipate heat in the porous medium.

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