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

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 In the current work, R-134a refrigerant has been replaced by R600a refrigerant as a working fluid inside the capillary tube, and the capillary tube design has been modified by altering length and diameter, which were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

Flow visualization of oscillation characteristics of liquid and vapor flow in the oscillating capillary tube heat pipe

2003 ◽  
Vol 17 (10) ◽  
pp. 1507-1519 ◽  
Author(s):  
Jong-Soo Kim ◽  
Ngoc Hung Bui ◽  
Ju-Won Kim ◽  
Jeong-Hoon Kim ◽  
Hyun Seok Jung
Keyword(s):  
Flow Visualization ◽  
Heat Pipe ◽  
Capillary Tube ◽  
Vapor Flow ◽  
Oscillation Characteristics

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

EHD-Enhanced Boiling Coefficients and Visualization of R-134a Over Enhanced Tubes

1997 ◽  
Vol 119 (2) ◽  
pp. 332-338 ◽  
Author(s):  
K. Cheung ◽  
M. M. Ohadi ◽  
S. Dessiatoun ◽  
A. Singh
Keyword(s):  
Heat Transfer ◽  
Flow Visualization ◽  
Boiling Heat Transfer ◽  
Tube Bundle ◽  
Pool Boiling ◽  
Nucleate Boiling ◽  
Transfer Coefficients ◽  
Surface Geometry ◽  
Pool Boiling Heat Transfer ◽  
R 134A

In an earlier study by the authors, the applicability of the EHD technique for augmentation of pool boiling heat transfer of R-134a in a tube bundle was demonstrated. This paper reports additional experiments involving optimization of the electrode/heat transfer surface geometry as well as flow visualization studies that provide improved understanding of the EHD-enhanced pool boiling heat transfer in a tube bundle. Utilizing the flow visualization studies, it is demonstrated that combined electroconvection and improved nucleate boiling dynamics give rise to the augmented heat transfer coefficients.

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