ESDU 91023 develops a prediction procedure for annular/dispersed flow based on that used for vertical downflow in ESDU 90024. It does not apply to bubble or slug flow but in those cases the pressure drop. Condensation inside tubes: Computer program for pressure drop in straight tubes horizontal and vertical with downflow - NASA/ADS ESDU 93014 introduces a Fortran program that implements the calculation procedures of ESDU 90024 and 91023 respectively for vertical and horizontal cases. Condensation inside tubes: Pressure drop in straight horizontal tubes - NASA/ADS A prediction procedure is developed for annular and/or dispersed flow based on that used for vertical downflow in ESDU 90024. It does not apply to bubble or slug flow, but in those cases the pressure drop is small. IHS ESDU 93014: Condensation inside tubes. Computer program for pressure drop in straight tubes horizontal and vertical with downflow. Condensation of pure fluids in downflow on horizontal integral low-fin tube bundles. ESDU 90024 Condensation inside tubes: pressure drop in straight tubes with vertical downflow. ESDU 91023 Condensation inside tubes: pressure drop in straight horizontal tubes. ESDU 91024 Condensation inside tubes: condensate film coefficient for vertical downflow.
In this study, the condensation frictional pressure drop of R-600a inside smooth and dimpled helically coiled tubes with mass flux of 75, 115, 156 and 191 kg m −2 s −1 and saturation temperature of 35° and 45 °C have been examined. The results obtained from dimpled helical coiled tube are compared with those for the smooth helical coiled. Nov 05, 2015 · In this study, condensation and pressure drop characteristics of R-600a inside a helical tube-in-tube heat exchanger is investigated experimentally. A series of experiments were carried out with the test section inclined at four different coil axis angles, 0° horizontal, 30°, 60° and 90° vertical.
Olivier et al. investigated the heat transfer, pressure drop and flow patterns in horizontal tubes during the condensation of R22, R407C and R134a at a saturation temperature of 40 °C in smooth, helical and herringbone microfin tubes for mass fluxes between 400 kg/m 2 s and 800 kg/m 2 s, for condenser inlet and outlet vapour qualities of. Dec 01, 2019 · Wen and Ho [15,16] investigated the condensing and evaporating heat transfer coefficient of R290/R600a inside horizontal straight and U-shaped tubes, moreover, in another study Ahmadpour et al. studied condensation heat transfer coefficient of R600a inside horizontal straight and U-shaped tubes; both resulted that using the U-shaped tubes. Condensation heat transfer and pressure drop characteristics of R-134a for the mass fluxes from 100 to 400 kg m −2 s −1 and cooling water Reynolds number between 1500 and 9000 inside a helicoidal tube at refrigerant saturation temperature 33 °C and the tube wall temperature at 12 and 22 °C has been experimentally investigated by Kang et.
condensation heat transfer and pressure drop characteristics in three horizontal 12.7 mm microfin tubes with R22. They found evaporation and condensation heat transfer coefficients in the microfin tubes were 1.6-2.2 and 1.5-2.0 times, respectively, larger than those in the smooth tubes. Kandlikar  presented a flow boiling heat transfer. Condensation inside tubes: pressure drop in straight horizontal tubes. -- 91023 ESDU 91023 develops a prediction procedure for annular/dispersed flow based on that used for vertical downflow in ESDU 90024. The frictional pressure drop of R22 during condensation inside micro-ﬁn tubes with outer diameters larger than 9 mm were reported in Muzzio et al.  and Smit and Meyer .
Baffled shell-and-tube heat exchangers; flow distribution, pressure drop and heat transfer coefficient on the shellside. ESDU 73031 Convective heat transfer during crossflow of fluids over plain tube banks. ESDU 69004 Convective heat transfer during forced crossflow of fluids over a circular cylinder including free convection effects. ESDU 74040. Flow condensation pressure drop characteristics of R410A–oil mixture inside small diameter 5.0 mm and 4.0 mm O.D. horizontal microfin tubes were investigated experimentally covering nominal. This study experimentally investigated heat transfer and pressure drop on condensation and evaporation flows of R410A inside horizontal aluminum microfin tubes at. This study investigated the evaporation heat transfer and pressure drop characteristics of R32 in a horizontal multiport tube consisting of rectangular minichannels with straight microfins. The heat transfer coefficient and pressure drop were measured for a mass velocity range of 50–400 kgm − 2 s − 1 and heat flux range of 5–20 kWm. In the present study, the two-phase flow pressure drop of pure HFC-134a during condensation under forced flow conditions inside horizontal smooth and micro-fin tubes are experimentally investigated.
Hashemi and Akhavan-Behabadi experimentally investigated the heat transfer and pressure drop characteristics of the pure oil and CuO/oil concentration up to 2% nanofluid flow inside a straight tube and a helical tube at low Reynolds number Re < 100. They reported a heat transfer enhancement of up to 18.7 and 30.4% was obtained for nanofluid. @articleosti_5405178, title = Evaporation and condensation heat transfer and pressure drop in horizontal, 12. 7-mm microfin tubes with refrigerant 22, author = Schlager, L M and Pate, M B and Bergles, A E, abstractNote = Using R-22 as the working fluid, a series of tests was performed to determine the evaporation and condensation performance of three 12.7-mm o.d. tubes having many. Jun 22, 2015 · Pressure drop calculation i. Tube side pressure drop In case of tube side condensation: For condensation in the tube side by taking one-half of the conventional pressure drop relation can be used. 2 12 1 2 7.5 10 t t p t i t t fG L n P d S, psi 1.14 Where, f = friction factor tG =mass velocity [lb. h-1.ft-2 ] tL =Tube length [ft] pn =Number. and five microfin tubes with the same outer diameter of 5 mm, the mass velocity was varied from 100 to 620 kg m-2 s-1, the heat flux from 5 to 31 kW m-2, at a saturation temperature of around 6 °C R22 pred = 0.12; R410A pred = 0.20. The test section was a 2 m long straight, horizontal tube-in-tube heat.
A lower condensation saturation temperature can generate a higher HTC and pressure drop. 5-mm-OD tube produces a higher HTC and pressure drop than the. The condensation heat transfer coefficient increased slightly with increasing mass flux. The pressure drop penalty was found to increase as mass flux increased. Compared with the smooth tube, the pressure drop of Cu-1EHTa tube, SS-1EHTa tube, and Cu-1EHTb tube were 1.15, 1.21, and 1.14 of smooth tube, respectively. R-410A evaporation heat transfer and pressure drop data are provided for three 7.0 mm O.D. microfin tubes. The microfin tubes had different helix angle, fin height and fin apex angle. Tests were conducted for a range of quality 0.2 ~ 0.8, mass flux 216 ~ 390 kg/m2s, heat flux 9 ~ 17 kW/m2 and saturation temperature 8 ~ 12°C. It was found that three microfin tubes yielded approximately. Standards and Technical Documents - Condensation inside tubes: pressure drop in straight horizontal tubes. -- 91023 Supplier: IHS ESDU Description: extracted from the literature for the flow of steam or halogenated hydrocarbons over a wide range of pressure, quality, and heat and mass flux.
Nov 15, 2000 · The oval tube was an elliptic tube of axis ratio 1:1.5, which was fabricated from the round tube with an outer diameter of 9.52 mm and 18 deg helix angle counterclockwise. The test section was a straight horizontal tube of 0.6 m in length and was heated electrically by a tape heater wound on the tube.
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