The main purpose of this paper was to experimentally study the heat transfer and pressure drop characteristics of refrigerant R134a boiling inside a new geometry microfin helically coiled tube. Experiments were performed in a range of mass quality from 0.05 up to 0.9, mass velocity 70 ∼ 380 kg/m2s and heat flux 2.0 ∼ 21.8 kW/m2. The local and average convective boiling heat transfer coefficients were reported in this paper, which were found to be dependent on both of mass flux and heat flux. Compared with corresponding smooth helically coiled tube, the microfin helically coiled tube could enhance the convective boiling heat transfer very well. The enhancement factor was up to 2.2 with the variety of mass flux and heat flux. Heat transfer in annular flow was specially studied. A flow boiling heat transfer correlation was presented for the annular flow regime, which had a mean deviation of 9.1%. The frictional pressure drop values were obtained by subtracting acceleration pressure drop and gravitational pressure drop from the measured total pressure drop. The frictional pressure drop data can be well correlated by Lockhart-Martinelli parameter. Considering the corresponding flow regimes, i.e., stratified and annular flow, two frictional pressure drop correlations were proposed, and showed a good agreement with the respective experimental data.
Skip Nav Destination
ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
July 17–22, 2005
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division and Electronic and Photonic Packaging Division
ISBN:
0-7918-4732-2
PROCEEDINGS PAPER
Convective Boiling Heat Transfer and Pressure Drop Characteristics of R134a in a Microfinned Helically Coiled Tube Available to Purchase
Wenzhi Cui,
Wenzhi Cui
Chongqing University, Chongqing, China
Search for other works by this author on:
Longjian Li,
Longjian Li
Chongqing University, Chongqing, China
Search for other works by this author on:
Mingdao Xin,
Mingdao Xin
Chongqing University, Chongqing, China
Search for other works by this author on:
Qinghua Chen,
Qinghua Chen
Chongqing University, Chongqing, China
Search for other works by this author on:
Quan Liao,
Quan Liao
University of Wisconsin at Milwaukee, Milwaukee, WI
Search for other works by this author on:
Tien-Chien Jen
Tien-Chien Jen
University of Wisconsin at Milwaukee, Milwaukee, WI
Search for other works by this author on:
Wenzhi Cui
Chongqing University, Chongqing, China
Longjian Li
Chongqing University, Chongqing, China
Mingdao Xin
Chongqing University, Chongqing, China
Qinghua Chen
Chongqing University, Chongqing, China
Quan Liao
University of Wisconsin at Milwaukee, Milwaukee, WI
Tien-Chien Jen
University of Wisconsin at Milwaukee, Milwaukee, WI
Paper No:
HT2005-72227, pp. 343-348; 6 pages
Published Online:
March 9, 2009
Citation
Cui, W, Li, L, Xin, M, Chen, Q, Liao, Q, & Jen, T. "Convective Boiling Heat Transfer and Pressure Drop Characteristics of R134a in a Microfinned Helically Coiled Tube." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 2. San Francisco, California, USA. July 17–22, 2005. pp. 343-348. ASME. https://doi.org/10.1115/HT2005-72227
Download citation file:
21
Views
Related Proceedings Papers
Related Articles
Heat Transfer Coefficient, Pressure Gradient, and Flow Patterns of R1234yf Evaporating in Microchannel Tube
J. Heat Transfer (April,2021)
Flow
Boiling Heat Transfer, Pressure Drop, and Flow Pattern for C O 2 in a 3.5 mm Horizontal Smooth
Tube
J. Heat Transfer (September,2009)
Improving Energy Efficiency of a Heat Exchanger Using Recovered Metal Chips During Forced Convection
J. Heat Mass Transfer (May,2025)
Related Chapters
Heat Transfer and Pressure Drop Correlations for Compact Heat Exchangers with Multi-Region Louver Fins
Inaugural US-EU-China Thermophysics Conference-Renewable Energy 2009 (UECTC 2009 Proceedings)
Adding Surface While Minimizing Downtime
Heat Exchanger Engineering Techniques
Experimental Setups, Procedures and Data Reduction at Supercritical Pressures
Heat Transfer & Hydraulic Resistance at Supercritical Pressures in Power Engineering Applications