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1.
Инвентарный номер: нет.
   
   M 43


    Maydanik, Yu. F.
    Development and tests of ammonia Miniature Loop Heat Pipes with cylindrical evaporators / Yu. F. Maydanik, S. V. Vershinin // Applied Thermal Engineering. - 2009. - Vol.29, №11-12. - С. 2297-2301
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPE -- EVAPORATOR -- CONDENSER
Аннотация: Miniature Loop Heat Pipes (MLHPs) are an attractive object for development and investigation as quite a promising means for cooling powerful electronics operating in the temperature range from 50 to 100 °C. The paper generalizes and presents the results of development and tests of 15 different variants of ammonia MLHPs with cylindrical evaporators 5 and 6 mm in diameter, which have an active zone length of 20 mm and are equipped with titanium and nickel wicks. As a result of successive efforts aimed at increasing the MLHPs efficiency, it was possible to achieve values of the heat-transfer coefficient close to 162,000 W/m2 °C at a value of the heat flux of about 100 × 104 W/m2. A maximum heat flux value of about 135 × 104 W/m2 was achieved at the heat-transfer coefficient equal approximately to 75,000 W/m2 °C

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2.
Инвентарный номер: нет.
   
   M 43


    Maydanik, Yu. F.
    Development and tests of ammonia Miniature Loop Heat Pipes with cylindrical evaporators / Yu. F. Maydanik, S. V. Vershinin // Applied Thermal Engineering. - 2009. - Vol.29, №11-12. - С. 2297-2301
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPE -- EVAPORATOR -- CONDENSER
Аннотация: Miniature Loop Heat Pipes (MLHPs) are an attractive object for development and investigation as quite a promising means for cooling powerful electronics operating in the temperature range from 50 to 100 °C. The paper generalizes and presents the results of development and tests of 15 different variants of ammonia MLHPs with cylindrical evaporators 5 and 6 mm in diameter, which have an active zone length of 20 mm and are equipped with titanium and nickel wicks. As a result of successive efforts aimed at increasing the MLHPs efficiency, it was possible to achieve values of the heat-transfer coefficient close to 162,000 W/m2 °C at a value of the heat flux of about 100 × 104 W/m2. A maximum heat flux value of about 135 × 104 W/m2 was achieved at the heat-transfer coefficient equal approximately to 75,000 W/m2 °C

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3.
Инвентарный номер: нет.
   
   M 19


    Maydanik, Yu. F.
    Development and Tests of Miniature Loop Heat Pipe with a Flat Evaporator / Yu. F. Maydanik, S. V. Vershinin, M. A. Chenysheva // SAE 2000 Transaction - Journal of Aerospace. - 2001. - Paper Number: 2000-01-2491
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMMONIA MINIATURE -- LOOP HEAT PIPE -- FLAT EVAPORATOR
Аннотация: The paper presents the results of analysis, development and tests of an ammonia miniature loop heat pipe (MLHP) with a flat evaporator, which has an active-zone diameter of 30mm. The length and the diameter of the vapor and the liquid lines are 1m and 2/1.2mm. The device serviceability has been demonstrated at a horizontal and a vertical orientation in 1-g conditions. The maximum heat load achieved on trials was equal, respectively, to 160W and 120W, which corresponds to a heat flow in the evaporation zone of 23 W/cm 2 and 17 W/cm 2 . The minimum thermal resistance at nominal heat loads from 40 to 80 W varied in the range from 0.42 W/m 2 K to 0.59 W/m 2 K. A comparison has been made with a model MLHP with a cylindrical evaporator equipped with a copper and aluminum “sa

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4.
Инвентарный номер: нет.
   
   M 19


    Maydanik, Yu. F.
    Development and Tests of Miniature Loop Heat Pipe with a Flat Evaporator / Yu. F. Maydanik, S. V. Vershinin, M. A. Chenysheva // SAE 2000 Transaction - Journal of Aerospace. - 2001. - Paper Number: 2000-01-2491
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMMONIA MINIATURE -- LOOP HEAT PIPE -- FLAT EVAPORATOR
Аннотация: The paper presents the results of analysis, development and tests of an ammonia miniature loop heat pipe (MLHP) with a flat evaporator, which has an active-zone diameter of 30mm. The length and the diameter of the vapor and the liquid lines are 1m and 2/1.2mm. The device serviceability has been demonstrated at a horizontal and a vertical orientation in 1-g conditions. The maximum heat load achieved on trials was equal, respectively, to 160W and 120W, which corresponds to a heat flow in the evaporation zone of 23 W/cm 2 and 17 W/cm 2 . The minimum thermal resistance at nominal heat loads from 40 to 80 W varied in the range from 0.42 W/m 2 K to 0.59 W/m 2 K. A comparison has been made with a model MLHP with a cylindrical evaporator equipped with a copper and aluminum “sa

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5.
Инвентарный номер: нет.
   
   V 50


    Vershinin, S. V.
    Effect of the thermal contact resistance on heat-transfer during boiling from fine porous capillary structures / S. V. Vershinin, Y. G. Fershtater, Yu. F. Maydanik // High Temperature. - 1992. - Vol.30, №4. - С. 668-673
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HEAT TRAHSFER -- VAPOR FORMATION
Аннотация: The dependence of the heat transfer rate on the geometry of vapor channels is investigated analytically and experimentally with a consideration of the thermal contact resistance during vapor formation in fine porous structures for carrying away the vapor. It is shown that the larger the contact resistance, the greater the distance between the channels must be to maximize the values of the heat-transfer coefficients

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6.
Инвентарный номер: нет.
   
   V 50


    Vershinin, S. V.
    Effect of the thermal contact resistance on heat-transfer during boiling from fine porous capillary structures / S. V. Vershinin, Y. G. Fershtater, Yu. F. Maydanik // High Temperature. - 1992. - Vol.30, №4. - С. 668-673
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HEAT TRAHSFER -- VAPOR FORMATION
Аннотация: The dependence of the heat transfer rate on the geometry of vapor channels is investigated analytically and experimentally with a consideration of the thermal contact resistance during vapor formation in fine porous structures for carrying away the vapor. It is shown that the larger the contact resistance, the greater the distance between the channels must be to maximize the values of the heat-transfer coefficients

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7.
Инвентарный номер: нет.
   
   C 51


    Chernysheva, M. A.
    Heat transfer during condensation of moving steam in a narrow channel / M. A. Chernysheva, S. V. Vershinin, Yu. F. Maydanik // International Journal of Heat and Mass Transfer. - 2009. - Vol.52, №11-12. - С. 2437-2443
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
INTUBE CONDENSATION -- TWO-PHASE FLOW -- LOOP HEAT PIPE
Аннотация: The paper presents the results of experimental investigation of heat transfer and hydrodynamics during condensation of moving steam in a narrow channel of square cross-section 2 mm × 2 mm. The channel had a serpentine shape, the channel length was 660 mm. An experimental cell simulated conditions of heat transfer in the condenser of loop heat pipes. The steam velocity at the channel inlet ranged from 13 to 52 m/s, the pressure was 1 atm. The temperature of the cooling water varied from 70 to 95 °C. The annular flow pattern was noted in the whole range of the regime parameters. There was a clear boundary between the condensation zone and the zone occupied by the condensed phase downstream. Temperature has measured along the channel, and the heat-transfer coefficients have been determined. The coefficient values varied from 10,000 to 55,000 W/K m2 depending on the steam velocity at the channel inlet and the cooling temperature. The efficiency of the condenser – heat exchanger has been investigated

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8.
Инвентарный номер: нет.
   
   C 51


    Chernysheva, M. A.
    Heat transfer during condensation of moving steam in a narrow channel / M. A. Chernysheva, S. V. Vershinin, Yu. F. Maydanik // International Journal of Heat and Mass Transfer. - 2009. - Vol.52, №11-12. - С. 2437-2443
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
INTUBE CONDENSATION -- TWO-PHASE FLOW -- LOOP HEAT PIPE
Аннотация: The paper presents the results of experimental investigation of heat transfer and hydrodynamics during condensation of moving steam in a narrow channel of square cross-section 2 mm × 2 mm. The channel had a serpentine shape, the channel length was 660 mm. An experimental cell simulated conditions of heat transfer in the condenser of loop heat pipes. The steam velocity at the channel inlet ranged from 13 to 52 m/s, the pressure was 1 atm. The temperature of the cooling water varied from 70 to 95 °C. The annular flow pattern was noted in the whole range of the regime parameters. There was a clear boundary between the condensation zone and the zone occupied by the condensed phase downstream. Temperature has measured along the channel, and the heat-transfer coefficients have been determined. The coefficient values varied from 10,000 to 55,000 W/K m2 depending on the steam velocity at the channel inlet and the cooling temperature. The efficiency of the condenser – heat exchanger has been investigated

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9.
Инвентарный номер: нет.
   
   H 65


   
    High heat flux loop heat pipes / M. T. North, D. B. Sarraf, J. H. Rosenfeld, Yu. F. Maydanik, S. V. Vershinin // SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM (STAIF-97), PTS 1-3: 1ST CONFERENCE ON FUTURE SCIENCE & EARTH SCIENCE MISSIONS; 1ST CONFERENCE ON SYNERGISTIC POWER & PROPULSION SYSTEMS TECHNOLOGY; 1ST CONFERENCE ON APPLICATIONS OF THERMOPHYSICS IN MICROGRAVITY; 2ND CONFERENCE ON COMMERCIAL DEVELOPMENT OF SPACE; - 2ND CONFERENCE ON NEXT GENERATION LAUNCH SYSTEMS; 14TH SYMPOSIUM ON SPACE NUCLEAR POWER AND PROPULSION, ALBUQUERQUE, 26-30 JAN, 1997 . - 1997. - Vol.387. - С. 561-566
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPES -- THERMAL POWER LOADS -- VAPOR FLOW LOSSES
Аннотация: Loop Heat Pipes (LHPs) can transport very large thermal power loads, over long distances, through flexible, small diameter tubes and against high gravitational heads. While recent LHPs have transported as much as 1500 W, the peak heat flux through a LHP's evaporator has been limited to about 0.07 MW/m(2). This limitation is due to the arrangement of vapor passages next to the heat load which is one of the conditions necessary to ensure self priming of the device. This paper describes work aimed at raising this limit by threefold to tenfold. Two approaches were pursued. One optimized the vapor passage geometry for the high heat flux conditions. The geometry improved the heat flow into the wick and working fluid. This approach also employed a finer pored wick to support higher vapor flow losses. The second approach used a bidisperse wick material within the circumferential vapor passages. The bidisperse material increased the thermal conductivity and the evaporative surface area in the region of highest heat flux, while providing a flow path for the vapor. Proof-of-concept devices were fabricated and tested for each approach. Both devices operated as designed and both demonstrated operation at a heat flux of 0.70 MW/m(2). This performance exceeded the known state of the art by a factor of more than six for both conventional heat pipes and for loop heat pipes using ammonia. In addition, the bidisperse-wick device demonstrated boiling heat transfer coefficients up to 100,000 W/m(2) K, and the fine pored device demonstrated an orientation independence with its performance essentially unaffected by whether its evaporator was positioned above, below or level with the condenser

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10.
Инвентарный номер: нет.
   
   H 65


   
    High heat flux loop heat pipes / M. T. North, D. B. Sarraf, J. H. Rosenfeld, Yu. F. Maydanik, S. V. Vershinin // 6th European Symposium on Space Environmental Control Systems: Noordwijk, Netherlands, 20-22 may 1997 . - 1997. - Vol. 400. - С. 371-376
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPES -- POWER LOADS -- GRAVITATIONAL HEADS
Аннотация: Loop Heat Pipes (LHPs) can transport very large thermal power loads, over long distances, through flexible, small diameter tubes and gravitational heads. While recent transported as much as 1500 W, the peak heat flux through a LHP's evaporator has been limited to about 0.07 MW/m(2). This limitation is due to the arrangement of vapor passages next to the heat load which is one of the conditions necessary to ensure self priming of the device. This paper describes work aimed at raising this limit by threefold to tenfold. Two approaches were pursued. One optimized the vapor passage geometry for the high heat flux conditions. The geometry improved the heat flow into the wick and working fluid. This approach also employed a finer pored wick to support higher vapor flow losses. The second approach used a bidisperse wick material within the circumferential vapor passages. The bidisperse material increased the thermal conductivity and the evaporative surface area in the region of highest heat flux, while providing a flow path for the vapor. Proof-of-concept devices were fabricated and tested for each approach. Both devices operated as designed and both demonstrated operation at a heat flux of 0.70 MW/m(2) This performance exceeded the known state of the art by a factor of more than six for both conventional heat pipes and for loop heat pipes using ammonia. In addition, the bidisperse-wick device demonstrated boiling heat transfer coefficients up to 100,000 W/m(2).K, and the fine pored device demonstrated an orientation independence with its performance essentially unaffected by whether its evaporator was positioned above, below or level with the condenser

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