Flow of partially condensed R-134a vapour through an adiabatic capillary tube

2018 ◽  
Vol 59 ◽  
pp. 1-7 ◽  
Author(s):  
Santhosh Kumar Dubba ◽  
Ravi Kumar
Keyword(s):  
Capillary Tube ◽  
R 134A

scholarly journals CFD Analysis of the Optimization of Length of Capillary Tube for a Vapor Compression Refrigeration System

2021 ◽  
Vol 9 (8) ◽  
pp. 2567-2578
Author(s):  
Ms. K. P. Bhangle
Keyword(s):  
Capillary Tube ◽  
Flow Analysis ◽  
Small Diameter ◽  
Flow Characteristics ◽  
Working Fluid ◽  
Vapor Compression ◽  
Adiabatic Flow ◽  
Ansys Cfx ◽  
Vapor Compression Refrigeration ◽  
R 134A

Abstract: The capillary tube is commonly employed in refrigerant flow control systems. As a result, the capillary tube's performance is optimal for good refrigerant flow. Many scholars concluded performance utilising experimental, theoretical, and analysis-based methods. This paper examines the flow analysis of a refrigerant within a capillary tube under adiabatic flow circumstances. For a given mass flow rate, the suggested model can predict flow characteristics in adiabatic capillary tubes. In the current work, R-134a refrigerant has been replaced by R600a refrigerant as a working fluid inside the capillary tube, and the capillary tube design has been modified by altering length and diameter, which were obtained from reputable literature. The analysis is carried out using the ANSYS CFX 16.2 software. The results show thatutilising a small diameter and a long length (R600a refrigerant flow) is superior to the present helical capillary tube. The most appropriate helical coiled design with a diameter of 0.8 mm and a length of 3 m is proposed. Keywords: Capillary Tube, Condenser, Refrigeration effect, CFD.

An Experimental Study of the Flow of R-407C in an Adiabatic Spiral Capillary Tube

2009 ◽  
Vol 1 (4) ◽  
Author(s):  
M. K. Mittal ◽  
R. Kumar ◽  
A. Gupta
Keyword(s):  
Experimental Data ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Capillary Tube ◽  
Flow Characteristics ◽  
Flow Rates ◽  
Tube Test ◽  
Mass Flow Rates ◽  
R 134A

The objective of this study is to investigate the effect of coiling on the flow characteristics of R-407C in an adiabatic spiral capillary tube. The characteristic coiling parameter for a spiral capillary tube is the coil pitch; hence, the effect of the coil pitch on the mass flow rate of R-407C was studied on several capillary tube test sections. It was observed that the coiling of the capillary tube significantly reduced the mass flow rate of R-407C in the adiabatic spiral capillary tube. In order to quantify the effect of coiling, the experiments were also conducted for straight a capillary tube, and it was observed that the coiling of the capillary tube reduced the mass flow rate in the spiral tube in the range of 9–18% as compared with that in the straight capillary tube. A generalized nondimensional correlation for the prediction of the mass flow rates of various refrigerants was developed for the straight capillary tube on the basis of the experimental data of R-407C of the present study, and the data of R-134a, R-22, and R-410A measured by other researchers. Additionally, a refrigerant-specific correlation for the spiral capillary was also proposed on the basis of the experimental data of R-407C of the present study.

Experimental investigation on diabatic flow of R-134a through spiral capillary tube

2009 ◽  
Vol 32 (2) ◽  
pp. 261-271 ◽  
Author(s):  
Mohd. Kaleem Khan ◽  
Ravi Kumar ◽  
Pradeep K. Sahoo
Keyword(s):  
Experimental Investigation ◽  
Capillary Tube ◽  
R 134A

An experimental study of the flow of R-134a inside an adiabatic spirally coiled capillary tube

2008 ◽  
Vol 31 (6) ◽  
pp. 970-978 ◽  
Author(s):  
Mohd. Kaleem Khan ◽  
Ravi Kumar ◽  
Pradeep K. Sahoo
Keyword(s):  
Experimental Study ◽  
Capillary Tube ◽  
R 134A

Computational Fluid Dynamics Modeling of Two-Phase Flow in an Adiabatic Capillary Tube

2014 ◽  
Vol 7 (1) ◽  
Author(s):  
Yogesh K. Prajapati ◽  
Manabendra Pathak ◽  
Mohd. Kaleem Khan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Capillary Tube ◽  
Mass Transfer Rate ◽  
Dynamics Modeling ◽  
Flow Properties ◽  
Two Phase ◽  
Flow Turbulence ◽  
R 134A ◽  
Volume Method

In this work computational fluid dynamics (CFD) technique has been used to analyze the detailed flow structures of refrigerant R-134a in an adiabatic capillary tube using volume of fluid based finite volume method. Also, an attempt has been made to understand the flashing phenomenon within the adiabatic capillary tube. A source term has been incorporated in the governing equations to model the mass transfer rate from liquid phase to vapor phase during the flashing process. The developed numerical model has been validated with the available experimental data. The unsteady variations of flow properties such as velocity, void fraction distributions, and flow turbulence across the cross section and at different axial length of the tube have been presented. It has been observed that flashing initiates from the wall of the tube. With the inception of vapor, the flow properties change drastically with very short transient period. As far as flow turbulence is concerned, the role of flashing parameter seems to be stronger than internal tube wall roughness.

scholarly journals Flow Visualization of R-134a in a Capillary Tube

2021 ◽  
Author(s):  
Jennifer R. Jewers ◽  
Robert R. Bittle
Keyword(s):  
Flow Visualization ◽  
Capillary Tube ◽  
R 134A

Experimental Study of the Flow of R-134a Through an Adiabatic Helically Coiled Capillary Tube

2008 ◽  
Vol 14 (5) ◽  
pp. 749-762 ◽  
Author(s):  
Mohd. Kaleem Khan ◽  
Ravi Kumar ◽  
Pradeep Sahoo
Keyword(s):  
Experimental Study ◽  
Capillary Tube ◽  
R 134A
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