Air side performance of thermosyphon heat exchanger in low Reynolds number region: with and without electric field

Wangnipparnto, Santi; Tiansuwan, J.; Jiracheewanun, Sujin; Kiatsiriroat, Tanongkiat; Wang, Chi-Chuan

doi:10.1016/s0196-8904(01)00136-4

Cited by 28 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Again, at high frontal velocity, the heat transfer coefficients of all cases are nearly the same. The phenomena are similar to the works of Wangnipparnto et al [6,7] who used electric field to enhance heat transfer in thermosyphon heat exchanger. Fig.…”

Section: Performance Analysissupporting

confidence: 85%

See 1 more Smart Citation

Effect of electric field on heat transfer performance of automobile radiator at low frontal air velocity

Vithayasai

Kiatsiriroat

Nuntaphan

2006

Applied Thermal Engineering

View full text Add to dashboard Cite

Section: Performance Analysissupporting

confidence: 85%

“…For example, Wangnipparnto et al [6,7] used the electric field to promote the heat transfer rate of the thermosyphon heat exchanger at low Reynolds number. Kui [8] studied the performance of air to air heat pipe under the electric field and developed the heat transfer model for the equipment.…”

Section: Introductionmentioning

confidence: 99%

Effect of electric field on heat transfer performance of automobile radiator at low frontal air velocity

Vithayasai

Kiatsiriroat

Nuntaphan

2006

Applied Thermal Engineering

View full text Add to dashboard Cite

“…Forced convection enhancement has been studied extensively for both laminar and turbulent internal flows [10][11] [12]. Additionally, ionic-wind-enhanced heat transfer has been investigated by Ohadi et al [13] for a shell-and-tube heat exchanger and by Wangnipparnto et al [14] in a thermosyphon heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of external forced convection by ionic wind

Maturana

Fisher

et al. 2008

International Journal of Heat and Mass Transfer

137

View full text Add to dashboard Cite

An ionic wind is formed when air ions are accelerated by an electric field and exchange momentum with neutral air molecules, causing air flow. Because ionic winds can generate flow with no moving parts and have low power consumption, they offer an attractive method for enhancing convection heat transfer from a surface. In the present work, corona discharges are generated between a steel wire and copper-tape electrode pair on a flat plate, perpendicular to the bulk flow direction such that the ensuing ionic wind is in the direction of the bulk flow. The corona discharge current is characterized, and experimental measurements of heat transfer from a flat plate are reported. Infrared images demonstrate that the cooling occurs along the entire length of the wire, and local heat transfer coefficients are shown to increase by more than 200% above those obtained from bulk flow alone. The magnitude of the corona current and the heat flux on the flat plate are varied. The heat transfer coefficient is shown to be related to the fourth root of the corona current both analytically and experimentally, and heat transfer enhancement is seen to be a solely hydrodynamic effect.Variation of the spacing between electrodes demonstrates that while the local peak enhancement is largely unaffected, the area of heat transfer enhancement is dependent on this spacing.

show abstract

“…The effect of the electro-magnetic forces on the heat transfer and friction factor has been studied for a tube, channel and tube bundles in the past. Yabe et al (1978Yabe et al ( , 1987, Yabe (1991), Kulacki (1983), Poulter & Allen (1986), Nelson et al (1991), Ohadi et al (1991), Ishiguro et al (1991), Ogata et al (1992), Wangnippanto et al (2001), but Lin & Jang (2005) were the first to apply the EHD electrodes on a finned-tube heat exchanger. They studied the effects of different arrangements of electrodes, applied voltage and tube pitch on the streamline, pressure and temperature profile for a finned tube heat exchanger [D = 20 mm, t f = 0.2 mm, f p = 6.2 mm, S l = 34.6 mm (for staggered arrangement), 40 mm (for inline arrangement), and S t = 40 mm].…”

Section: Plate Finsmentioning

confidence: 99%

A review on the thermal hydraulic characteristics of the air-cooled heat exchangers in forced convection

Kumar

Joshi

Nayak

et al. 2015

Sadhana

View full text Add to dashboard Cite

In this paper, a review is presented on the experimental investigations and the numerical simulations performed to analyze the thermal-hydraulic performance of the air-cooled heat exchangers. The air-cooled heat exchangers mostly consist of the finned-tube bundles. The primary role of the extended surfaces (fins) is to provide more heat transfer area to enhance the rate of heat transfer on the air side. The secondary role of the fins is to generate vortices, which help in enhancing the mixing and the heat transfer coefficient. In this study, the annular and plate fins are considered, the annular fins are further divided into four categories: (1) plane annular fins, (2) serrated fins, (3) crimped spiral fins, (4) perforated fins, and similarly for the plate fins, the fin types are: (1) plain plate fins, (2) wavy plate fins, (3) plate fins with DWP, and (4) slit and strip fins. In Section 4, the performance of the various types of fins is presented with respect to the parameters: (1) Reynolds number, (2) fin pitch, (3) fin height, (4) fin thickness, (5) tube diameter, (6) tube pitch, (7) tube type, (8) number of tube rows, and (9) effect of dehumidifying conditions. In Section 5, the conclusions and the recommendations for the future work have been given.

show abstract

Air side performance of thermosyphon heat exchanger in low Reynolds number region: with and without electric field

Cited by 28 publications

References 3 publications

Effect of electric field on heat transfer performance of automobile radiator at low frontal air velocity

Effect of electric field on heat transfer performance of automobile radiator at low frontal air velocity

Enhancement of external forced convection by ionic wind

A review on the thermal hydraulic characteristics of the air-cooled heat exchangers in forced convection

Contact Info

Product

Resources

About