Heat and mass transfer in commercial desorbers with a heating surface in the form of a vertical tube bundle and a thermofluidized heat-carrier bed

1986 ◽  
Vol 50 (5) ◽  
pp. 549-553
Author(s):  
A. P. Nesenchuk ◽  
A. M. Gabri�l' ◽  
E. N. Antonishina ◽  
V. A. Sednin ◽  
A. A. Sklyar ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Heat Carrier ◽  
Tube Bundle ◽  
Heating Surface ◽  
Vertical Tube

NUMERICAL STUDIES ON VERTICAL TUBULAR GENERATOR IN VAPOR ABSORPTION REFRIGERATION SYSTEM

2011 ◽  
Vol 19 (02) ◽  
pp. 121-129 ◽  
Author(s):  
PASUPATHY BALAMURUGAN ◽  
ANNAMALAI MANI
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Computer Code ◽  
Vertical Tube ◽  
Hot Water ◽  
Convective Boiling ◽  
Model Equations ◽  
Absorption Refrigeration System ◽  
Problem Solvers ◽  
Vapor Absorption Refrigeration

A model has been developed based on Colburn–Drew type formulation to analyze a vertical tube in tube stainless steel generator with forced convective boiling. Desorption of refrigerant vapor from refrigerant–absorbent solution takes place in the inner tube of the generator, when hot water through the annulus is used as heating medium. Simultaneous heat and mass transfer phenomena of desorption are described mathematically using the mass and energy balances, considering the heat and mass transfer resistances in liquid as well as vapor phases. Model equations are solved simultaneously by means of initial value problem solvers using explicit Runge–Kutta method with 4th order accuracy. A computer code has been developed in MATLAB to obtain the results. A parametric analysis has also been performed to study the effect of various parameters on the performance of the generator.

Study of Condensation Flow Patterns and Heat Transfer Characteristic on a Horizontal Tube Bundle

2016 ◽  
Author(s):  
Hongfang Gu ◽  
Qi Chen ◽  
Zhe Zhang ◽  
Haiyang Guo
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Mass Transfer ◽  
Flow Regime ◽  
Heat And Mass Transfer ◽  
Tube Bundle ◽  
Flow Patterns ◽  
Heat Transfer Characteristics ◽  
Controlled Flow ◽  
Condensation Flow

The numerous studies on condensation flow patterns and heat transfer were focused on the horizontal inside single tube. A number of heat and mass transfer correlations are used for design of shellside condensers based on tubeside condensation flow regimes. Due to a complex geometry and measurement difficulty in a tube bundle, there are few publications reported on shellside condensation flow regime and heat transfer characteristics. To investigate the condensation flow patterns and heat and mass transfer mechanism at the different flow regimes, a horizontal shellside condenser was tested from a multipurpose condensation rig recently. The horizontal test bundle is made of 36 tubes with the staggered tube layout. The tube OD is 19 mm and the tube length is 1.0 m using stainless steel. Four visualization windows were placed on the front and back sides on the shell for photographing condensation flow patterns. Steam and steam/air mixture were used as the test fluids. The condensation flow patterns, condensate film thickness and droplets distribution were recorded using a high-speed digital camera at a wide range of condensation process conditions. The experimental data show that the condensation flow regime changes from the shear-controlled flow to gravity-controlled flow depending on the vapor and condensate loads, bundle location and the concentration of the non-condensable gas. These experimental data provide a fundamental approach for developing the heat and mass transfer correlateons at different shellside condensation patterns. This paper presents the experimental result on shellside condensation patterns associated with heat transfer characteristics.

Heat and Mass Transfer Analogy of Steam Condensation With Air Over Vertical External Surface

2016 ◽  
Author(s):  
Jiqiang Su ◽  
Yuxiang Wu ◽  
Shuliang Huang ◽  
Huiqiang Xu ◽  
Yanmin Zhou
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
External Surface ◽  
Vertical Tube ◽  
External Diameter ◽  
Thermodynamic Process ◽  
Layer Model ◽  
Steam Condensation ◽  
Predicted Values

During the steam condensation, the presence of non-condensable gases is an important issue affecting the efficiency of the whole thermodynamic process. For this reason, many researchers investigated it by theoretical or experimental methods. A heat and mass transfer analogy model on steam condensation in presence of air over the vertical external surface based on the diffusion layer model is modified in the present paper. Based on previous authors’ experience, the suction effect at the gas-liquid interface and other analogy drawbacks are identified and overcome by supplementing it with more detailed analysis as well as targeted experiments. The experimental data obtained for condensation, outside vertical tube with an external diameter of 38 mm, of air/steam and helium/air/steam mixture, have been used to verify the present heat and mass transfer analogy formulation. By comparing against different available experimental data and previous formulations, the heat and mass transfer analogy formulation is demonstrated to be a accurate enough theoretical approximation. The deviation between predicted values of the new model and experiment results of this paper is less than 15% which has relative higher precision.

An approach to heat and mass transfer analysis during film condensation inside a vertical tube

1993 ◽  
Vol 20 (2) ◽  
pp. 265-277 ◽  
Author(s):  
I. Kotcioglu ◽  
A.Y. Uyarel ◽  
K. Kaygusuz ◽  
S. Gullapoglu ◽  
I. Dincer
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Vertical Tube ◽  
Film Condensation
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