THE IMPACT OF HEAT TRANSFER MODE ON THE EFFICIENCY OF HEAT ENGINES OPERATING AT MAXIMUM POWER

1990 ◽  
Author(s):  
J. M. Gordon
Keyword(s):  
Heat Transfer ◽  
Maximum Power ◽  
Heat Transfer Mode ◽  
Transfer Mode ◽  
Heat Engines ◽  
The Impact

Research and Numerical Simulation of Heat Transfer Problems in the Industrial Production

2013 ◽  
Vol 756-759 ◽  
pp. 1679-1683
Author(s):  
Dong Mei Li ◽  
Xin Chun Wang ◽  
Li Nan Shi ◽  
Bo Chao Qu
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Steel Industry ◽  
Heat Transfer Mode ◽  
Radiation Model ◽  
Transfer Mode ◽  
The Difference ◽  
Transfer Problems ◽  
Direct Problems ◽  
The Impact

This article focuses on heat conduction problems in the process of steel industry. Modeling the direct problems of heat transfer, establish heat conduction and thermal radiation model. Model discretization method are used, discussion process from one dimension to two. We give the difference schemes, and the numerical example. Through the results we compare differences between one and two dimensional models, and the impact to the results of the two heat transfer mode.

scholarly journals Thermophysical Characterization and Numerical Investigation of Three Paraffin Waxes as Latent Heat Storage Materials

2019 ◽  
Author(s):  
Manel Kraiem ◽  
Mustapha Karkri ◽  
Sassi Ben Nasrallah ◽  
patrick sobolciak ◽  
Magali Fois ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Rayleigh Number ◽  
Heat Storage ◽  
Numerical Study ◽  
Melting Process ◽  
Heat Transfer Mode ◽  
Transfer Mode ◽  
Paraffin Waxes ◽  
Thermophysical Characterization

Thermophysical characterization of three paraffin waxes (RT27, RT21 and RT35HC) is carried out in this study using DSC, TGA and transient plane source technics. Then, a numerical study of their melting in a rectangular enclosure is examined. The enthalpy-porosity approach is used to formulate this problem in order to understand the heat transfer mechanism during the melting process. The analysis of the solid-liquid interface shape, the temperature field shows that the conduction is the dominant heat transfer mode in the beginning of the melting process. It is followed by a transition regime and the natural convection becomes the dominant heat transfer mode. The effects of the Rayleigh number and the aspect ratio of the enclosure on the melting phenomenon are studied and it is found that the intensity of the natural convection increases as the Rayleigh number is higher and the aspect ratio is smaller. In the second part of the numerical study, a comparison of the performance of paraffins waxes during the melting process is conducted. Results reveals that from a kinetically RT21 is the most performant but in term of heat storage capacity, it was inferred that RT35HC is the most efficient PCM.

Development of a New Heat Transfer Model Near the Quench Front in the Reflooding Phase of a Tight Lattice

2012 ◽  
Author(s):  
Dan Wu ◽  
Hongxing Yu ◽  
Junchong Yu ◽  
Jie Li ◽  
Jiyang Yu
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Liquid Film ◽  
Temperature Drop ◽  
Transfer Model ◽  
Heat Transfer Mode ◽  
Transfer Mode ◽  
Film Evaporation ◽  
Quench Temperature ◽  
Tight Lattice

Heat transfer characteristics near the quench front in a reflooding process are quite complex. Large amount of vapor are generated, and the rod clad temperature drops rapidly to near saturation state. Until now, heat transfer mechanism in this region has not been well understood yet. Best estimate codes like RELAP5, COBRA-TF tend to treat the heat transfer mode near the quench front as transition boiling. However, when calculating the reflooding phase of tight lattice, these codes always under-predict the quench temperature, and also the slop of the temperature drop is predicted to be less steep than the experimental data. In this paper, a new heat transfer model near the quench front in the reflooding phase of a tight lattice is developed. Instead of transition boiling, transient liquid film evaporation is considered to be the main heat transfer mode in this region. It is supposed that heat released near the quench front is through liquid film evaporation. Through comparisons with experimental data, it can be concluded that the new model can better predict the quench temperature and the temperature drop slop.

Inverse Analysis of Radiative Heat Transfer Systems

1999 ◽  
Vol 121 (2) ◽  
pp. 481-484 ◽  
Author(s):  
M. R. Jones
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Inverse Analysis ◽  
Radiative Heat ◽  
Inverse Methods ◽  
Heat Transfer Mode ◽  
Inverse Approach ◽  
Transfer Mode ◽  
Industrial Problem

The design of heat transfer systems in which radiation is the dominant heat transfer mode is an important industrial problem. Compared to the conventional forward approach, the inverse approach allows a more thorough analysis of a potential design. This note demonstrates that inverse methods can be powerful tools in the analysis of radiative heat transfer systems.

Numerical Simulation of Paraffin Melting Process in an Inclined Channel

2021 ◽  
Vol 896 ◽  
pp. 111-116
Author(s):  
Yan Li ◽  
Guo You You ◽  
Zhu Qunzhi
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Early Stage ◽  
Liquid Paraffin ◽  
Convection Heat Transfer ◽  
Melting Process ◽  
Heat Transfer Mode ◽  
Dominant Position ◽  
Transfer Mode ◽  
Higher Temperature

Numerical simulation of the melting of paraffin in the inclined straight channel shows that the melting speed of paraffin is faster in the early stage and gradually slows down in the later stage. It is found that heat conduction is the main heat transfer mode in the early stage of paraffin melting. With the increasing number of liquid paraffin, natural convection occurs in the liquid paraffin. The liquid paraffin with higher temperature flows upward due to the effect of buoyance and lift, and convection heat transfer gradually increases and takes the dominant position in the melting process.

Dynamic and Controlled Tuning of the Boiling Curve During Quenching

2016 ◽  
Author(s):  
Arjang Shahriari ◽  
Mark Hermes ◽  
Vaibhav Bahadur
Keyword(s):  
Heat Transfer ◽  
Cooling Rate ◽  
Electric Fields ◽  
Vapor Layer ◽  
Steam Generation ◽  
Transfer Enhancement ◽  
Heat Transfer Mode ◽  
Electrical Control ◽  
Transfer Mode ◽  
Quenching Media

Boiling influences many industrial processes like quenching, desalination and steam generation. Boiling heat transfer at high temperatures is limited by the formation of a vapor layer between the solid and fluid. Low thermal conductivity of this vapor layer inhibits heat transfer. Electrowetting (EW) fields can breakdown this vapor layer to promote wetting, and this concept works for many quenching media including water and organic solvents. This work studies the suppression of this vapor layer and measures the resulting heat transfer enhancement during quenching of metals. We image the fluid-surface interactions and boiling patterns in the presence of an electrical voltage. EW fields replace film boiling with periodic wetting-rewetting cycles and thus fundamentally change the heat transfer mode. The increased wettability substantially reduces the cool down time. The cooling rate can by increased by as much as 3X. The results show that electric fields can dynamically tune the classical quenching curve. This study opens up new avenues to control the metallurgy of metals via electrical control of the cooling rate.

scholarly journals High Performance of Solar Cooker by Heat Transfer Mode Condition System Using Fuzzy Logic Controller Applications

2018 ◽  
Vol 7 (4.10) ◽  
pp. 278 ◽  
Author(s):  
Bhavani S ◽  
Shanmugan. S ◽  
Selvaraju P
Keyword(s):  
Heat Transfer ◽  
Fuzzy Logic ◽  
Thermal Performance ◽  
System Performance ◽  
High Performance ◽  
Fuzzy Logic Controller ◽  
High Efficiency ◽  
Low Cost ◽  
Heat Transfer Mode ◽  
Transfer Mode

In this work has been made to predict the effect of several parameters on the productivity to a system by expending fuzzy set technique. A solar cooker has been developed low cost and critically high efficiency produce in Vel Tech Multitech Engineering College at Chennai, Tamilnadu, India. Dissects in thermal performance of cooking system have been produced heat transfer follow in fuzzy logic techniques (Low, Medium, and High). The thermal effect of factor should be developed in fuzzy logic for the system. They should have groups of heat transfer produced in fuzzy logic controller for solar cooker system which had been implemented of system performance discussed. It is to study have induced to give the shortly time for the enhancement of the box solar cooker production.  

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