Experimental investigation of heat transfer and pressure drop in a circular tube with multiple inserts

Vashistha, Chaitanya; Patil, Anil Kumar; Kumar, Manoj

doi:10.1016/j.applthermaleng.2015.11.077

Cited by 113 publications

(25 citation statements)

References 21 publications

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“…They achieved the highest thermal performance factor of 1.34 for the range of tested Re . Similar studies were conducted by Vashistha et al using single, double, and four tapes with both the co‐swirl and counter‐swirl condition. They revealed that the counter swirl was better and also four tapes also gave a maximum value of the thermal performance factor.…”

Section: Introductionsupporting

confidence: 61%

“…In the initial phase of the study, the legitimacy of the numerically studied results for two tape conditions are validated by using the experimental results reported by Vashistha et al Numerical modeling was done using two twisted tape geometries under the co‐swirl condition with a twist ratio of 2.5 and retaining other design and flow conditions as specified by Vashistha et al Numerical simulation was conducted for different Reynolds numbers and heat transfer characteristics are analysed. Simulation and experimental results for Nusselt number ( Nu ) and friction factor ( f ) have been plotted and are shown in Figures and , respectively.…”

Section: Numerical Modelmentioning

confidence: 95%

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Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Kumar

Dinesha

Narayanan

et al. 2019

Heat Trans. Asian Res.

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Introducing passive devices in the form of inserts helps to increase the heat transfer characteristics in a circular pipe. In the present work, the feasibility of using two twisted tapes has been numerically studied under laminar flow conditions. Two twisted tapes with configurations of co‐swirl and counter‐swirl conditions were simulated for Re ranging from 1000 to 2500. Heat transfer characteristics like Nusselt number, friction factor, and thermohydraulic performance index (THPI) were investigated. Even the effect of spacing of the tubes inside the pipe was numerically studied. Results indicated that the insertion of two tapes will improve the performance of the circular tube compared with a single tape in terms of a higher Nu and higher THPI. It is observed that for the co‐swirl condition for a Reynolds number of 1000, Nu and THPI is 38% and 29% higher than using a single tape, whereas, for the counter‐swirl condition, they are 43% and 34% higher than that of the single tape condition. Also, it is revealed that counter swirl positioning of the tape with an L/D ratio 0.56 outperformed all other configurations with the highest THPI.

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Section: Introductionsupporting

confidence: 61%

Section: Numerical Modelmentioning

confidence: 95%

Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Kumar

Dinesha

Narayanan

et al. 2019

Heat Trans. Asian Res.

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“…The inlet water temperature and flow rate were separately set through changing the heaters and the water flow adjustment valve. And the data logger with computer was used to record data from these thermocouples persistently (Lim et al, 2007;Luo et al, 2015;Vashistha et al, 2016).…”

Section: Methodology 21 Laboratory Investigationmentioning

confidence: 99%

Laboratory investigations and numerical analysis of thermal performance of the single U-tube VBHE in multiple-layer substrates

Liu

Huang

Yang

et al. 2018

JTST

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In order to study the thermal performance of a single U-tube VBHE in multiple-layer substrates, the similarity principle was used to build an indoor comprehensive miniature bench of single U-tube VBHE innovatively, and effects of inlet water temperature and hydrogeological geology on the thermal performance of VBHE were analyzed. In addition, numerical simulation was used to assist in the research. The results indicate that to build a laboratory-scale GSHP system model test apparatus based on the similarity principle will achieve long-term test of GSHP system with smaller human and material resources and a shorter experimental cycle. It's more efficient and convenient. The simplified use of uniform soil thermal and physical properties can cause great deviation. Heat flux per unit pipe of the VBHE increases linearly with the temperature difference's increasing between the inlet water and initial soil. The water temperature along the tube under thermal conductivity increasing and decreasing conditions does not decrease as linearly as the temperature's decreasing under the uniform thermal conductivity condition.

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“…Chaitanya et al [16] investigated for HTC, FF and η for single, twin and four twisted tape insets at a time with twist ratio of 2, 3 and 3.5 for the Re in the range of 4000 to 14000. It was reported that as the number of twisted tape increases, the HTC augmentation and FF increases.…”

Section: Review On Multiple Twisted Tapes Insertsmentioning

confidence: 99%

Augmentation of Heat Transfer in a Single Phase Flow Using Simple and Modified Twisted Tape Inserts: A Review

Tank¹

2017

IJRASET

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Heat exchanger is essential devices in process industries, power plant and refineries for the exchange of heat from one fluid to another fluid. It finds wide industrial, commercial and domestic applications. Keeping in mind today's energy crisis lots of researchers are working on active and passive methods for the enhancement of heat transfer rate. Use of twisted tape insert is one of the passive methods of enhancing heat transfer rate in conventional conduits with pressure drop penalty. An exhaustive review has been presented in this paper so it will be ready reference for those who want implement twisted tape insert in the heat exchanger. The experimental investigation of plain twisted tape and modified twisted tape of various configurations with its main findings are presented in compact form. The main focused of the present study is heat transfer enhancement, friction factor and enhancement ratio for the compactness, savings in pumping power for the operation of heat exchanger.

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Experimental investigation of heat transfer and pressure drop in a circular tube with multiple inserts

Cited by 113 publications

References 21 publications

Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Laboratory investigations and numerical analysis of thermal performance of the single U-tube VBHE in multiple-layer substrates

Augmentation of Heat Transfer in a Single Phase Flow Using Simple and Modified Twisted Tape Inserts: A Review

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