Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Yadav, Saurabh; Sahu, Santosh Kumar

doi:10.1002/ceat.201800251

Cited by 11 publications

(3 citation statements)

References 23 publications

(135 reference statements)

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“…The strict requirements for heat exchange equipment improvement have led to the development of highperformance heat exchangers. The improvement of heat transfer in pipes has been the subject of numerous studies using a variety of methods, including twisted pipe Ray and Date [1] Yaningsih et al [2] Bellos and Tzivanidis [3] and helical screw Sivashanmugam and Suresh [4] Sadeghi et al [5].The effect of the twisted tape on heat transmission and pressure loss in a heat exchanger was investigated experimentally by Yadav [6]. The dimension of tank (0.8 m x 0.8 m x 1 m)and diameter of tube 5cm with length 1.85m.It depicts that, from results, the heat transfer coefficient increases by 40% with half-length twisted tape inserts when compared with plain heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance analysis of heat transfer in pipe by using metal foam

2023

jjmie

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In this work, turbulent forced convection heat transfer in a circular horizontal pipe with insert of metal foam under the condition of constant heat flux is experimentally investigated. The Nusselt number (Nu) and friction factor (f) were tested under heat flux (31.8 and 42.4 )KW/m 2 and water flow rates (3, 6 and 9) lit/min. Circular copper pipe with dimensions of 0.6 m in length, 0.025 m in diameter, and 0.001 m in thickness acts as the test section for the current investigation. It is heated by an electric heater mounted outside the pipe. The foam has pores per inch ranging from (10 to 40) PPI and porosity between ( 0.89 and 0.93).The water flowing through the pipe has a regular input temperature of 32°C.The temperature was measured along the pipe distributed in seven sections of the wall, in addition to measuring the temperature of entering and exiting the water from the pipe. The results show that, with a heat flux of 42.4 KW/m 2 , the copper metal foam of 40 PPI gives a higher increase in average Nusselt number up to 73% as compared to metal foam of 10 PPI of 63.74%. The difference in pressure drop between pipes with and without metal foam varies just slightly at 10 PPI, but becomes greater at 40 PPI.

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Section: Introductionmentioning

confidence: 99%

Thermal performance analysis of heat transfer in pipe by using metal foam

2023

jjmie

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“…They found that an elliptical tube can dramatically increase the comprehensive performance when the shell-side Reynolds number is relatively small. Yadav [11] Many scholars have focused on studying the effects of different heat transfer structures on the performance of heat exchangers, and seldom consider the influence of the external air temperature of the heat exchanger shell on heat exchanger performance. Du [10] investigated continuous helical baffled heat exchangers with different arrangements in inclination angle of the elliptical tube, by using numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

“…They found that an elliptical tube can dramatically increase the comprehensive performance when the shell-side Reynolds number is relatively small. Yadav [11] studied the effect of helical surface disc turbulators on the performance of double-pipe heat exchangers and discovered that a heat exchanger with smaller pitch and diameter had the highest performance. Gu [12] numerically and experimentally investigated the performance of a heat exchanger with a trapezoidal baffle.…”

Section: Introductionmentioning

confidence: 99%

Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

et al. 2020

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A downhole electric heater, which reduces heat loss along a heat insulation pipe, is a key apparatus used to ignite oil shale underground. Downhole heaters working together with packers can improve the heating efficiency of high-temperature gases, while different packer locations will directly affect the external air temperature of the heater shell and, subsequently, the performance and total cost of the downhole heaters. A device was developed to simulate the external conditions of heater shells at different packer locations. Then, the effects of external air temperature on the performance of a downhole heater with pitches of 50, 160, and 210 mm were experimentally studied. In the test, results indicated that the heater with a packer at its outlet had an accelerated heating rate in the initial stage and decreased temperature in the final stage. Additionally, the lowest heating rod surface temperature and highest comprehensive performance were achieved with minimal irreversible loss and lower total cost when using a downhole electric heater with a packer set at its outlet. In addition, the downhole electric heater with a helical pitch of 50 mm and a packer at its outlet was more effective than other schemes in the high Reynolds number region. These findings are beneficial for shortening the oil production time in oil shale in situ pyrolysis and heavy oil thermal recovery.

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