ISSN:0145-7632    

DOI:10.1080/01457639308939802

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Cyclone furnaces have been in use for steam generation for over 45 years. The tubes that form the rear wall of the cyclone furnace, called the reentrant throat, are prone to warping, which results in gaps between the tubes. These gaps should not be present, as they allow fuel to escape from the furnace without burning. The colloq“picket fence,” is used to describe these gaps because of their resemblance to a wooden picket fence. Many gap-filling techniques have been utilized over the years, but none has completely solved the problem of recurring gaps. An investigation, both theoretical and experimental, has been conducted to determine the heat transfer characteristics of the fin / refractory system used to fill these gaps. Ample evidence suggests that thermal stresses in the weld joint between the fin and the tubes contribute to the failure of the fins.

ISSN:0145-7632    

DOI:10.1080/01457639308939803

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

A straightforward heat exchanger thermal model is presented and verified experimentally. It may be used to predict the performance of a coil that has condensation occurring on the gas side. Experimentally determined heat and mass transfer coefficients are employed in the model Sample data are presented for a wide range of surface wetting conditions. Partially wet heat exchangers are analyzed by employing an area weighting scheme to the dry and wet portions of the coil with moderate success. It is shown that employing a heat / mass transfer analogy in predicting the performance of a condensing heal exchanger may lead to a considerably undersized coil design.

ISSN:0145-7632    

DOI:10.1080/01457639308939804

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

This article is devoted to the results of studying the heat and mass transfer pr“particle-gas” systems proceeding in a bed fluidized in the field of centrifugal force. It has been shown that the processes are essentially intensified under these conditions as compared to those in fluidized beds. Under fluidization in the field of centrifugal force it is possible to obtain a steady uniform vortical layer of particles, which is uniformly blown through by gas with relative velocities exceeding the velocity of the particle swirling in a carrying medium. There exists a possibility of controlling this layer and the residence time of particles

ISSN:0145-7632    

DOI:10.1080/01457639308939805

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

In the oxy-acetylene combustion method, the quality and morphology of the diamond film depends on a variety of factors, including the substrate surface temperature, gas flow rates and their ratio, and substrate position. Due to the nature of the oxy-acetylene flame, surface temperature of the substrate varies in the radial direction. The substrate temperature profile, in turn, is influenced by the coolant flow rate, nozzle size, substrate position on the heat sink, substrate position in the combustion flame, and the total flow rate of mixed gas (acetylene and oxygen). In this article, temperature measurements using fine-gauge thermocouples were made to characterize the influence of these parameters on the substrate temperature profile.

ISSN:0145-7632    

DOI:10.1080/01457639308939806

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor