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Shuiming Shu - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Microgravity on flow boiling heat transfer of liquid hydrogen in transportation pipes
    International Journal of Hydrogen Energy, 2018
    Co-Authors: Yao Zheng, Jianye Chen, Huawei Chang, Hong Chen, Shuiming Shu
    Abstract:

    The flow boiling phenomenon of liquid hydrogen (LH2) during transportation in Microgravity is very different from that under terrestrial Condition. In this study, a saturated flow boiling of LH2 in a horizontal tube has been simulated under Microgravity Condition using coupled level-set and volume of fluid method. The validation of the developed model shows good agreement with the experimental data from the literature. The changes of heat fluxes and pressure drops under different gravitational accelerations were analyzed. And, the variation of heat fluxes with different wall superheat and contact angle were compared between Microgravity (10−4g) and normal gravity (1g) Condition. Also, the influence of surface tension were studied under Microgravity. The numerical results indicate that the heat flux decrease with the decrement of gravitational acceleration. And the heat transfer ratio decrease with the increment of wall superheat in the nucleate boiling regime. The heat transfer slightly reduce when considering surface tension. In addition, the changes of contact angle have a more significant impact on heat transfer under Microgravity Condition.

Xiuqing Duan - One of the best experts on this subject based on the ideXlab platform.

  • cotransplanation of parathyroid cell cultured under simulated Microgravity Condition and allogeneic testicular sertoli cell
    Chineae Journal of Organ Transplantation, 2011
    Co-Authors: Shuangfeng Xue, Dajiang Zhao, Xiuqing Duan
    Abstract:

    Objective To observe the function and survival of parathyroid cells cultured under simulated Microgravity Condition after cotransplanation of syngeneic allogeneic testicular sertoli cells.Methods Parathyroid cells in SD rats were assigned to flask-culture or bioreactor-culture.Allogeneic testicular sertoli cells in SD rats were cultured by using routine method.The recipients of hypoparathyroidism Wistar rat models were divided into 3 groups randomly:group A,receiving parathyroid cells(cultured with routine method)transplantation only;group B,receiving parathyroid cells and allogeneic testicular sertoli cells(cultured with routine method)transplantation;group C,receiving parathyroid cells(cultured under simulated Microgravity Condition)and allogeneic testicular sertoli cells transplantation.Allograft survival,change in cell components,apoptosis of infiltrative lymphocytes and parathyroid cells function were analyzed after transplantation respectively.Results The average survival time in group A,B and C was(17.3±1.6),(43.2±2.4)and (52.5±1.5)days,respectively.There was significant difference among group (P<0.05).In group C,parathyroid cells with strong secreting function grew into scaffold materials and adhered to them.FasL-expressing testicular cells and apoptotic lymphocytes were quite evident between allograft and kidney parenchyma.Conclusion Parathyroid cell cultured under simulated Microgravity Condition enhances its survival and function after cotransplanation of allogeneic testicular sertoli cell with immune privilege. Key words: Weighlessness simulation; 3-dimension culture; Parathyroid; Sertoli cells

  • Cotransplanation of parathyroid cell cultured under simulated Microgravity Condition and allogeneic testicular sertoli cell
    Chineae Journal of Organ Transplantation, 2011
    Co-Authors: Shuangfeng Xue, Dajiang Zhao, Xiuqing Duan
    Abstract:

    Objective To observe the function and survival of parathyroid cells cultured under simulated Microgravity Condition after cotransplanation of syngeneic allogeneic testicular sertoli cells.Methods Parathyroid cells in SD rats were assigned to flask-culture or bioreactor-culture.Allogeneic testicular sertoli cells in SD rats were cultured by using routine method.The recipients of hypoparathyroidism Wistar rat models were divided into 3 groups randomly:group A,receiving parathyroid cells(cultured with routine method)transplantation only;group B,receiving parathyroid cells and allogeneic testicular sertoli cells(cultured with routine method)transplantation;group C,receiving parathyroid cells(cultured under simulated Microgravity Condition)and allogeneic testicular sertoli cells transplantation.Allograft survival,change in cell components,apoptosis of infiltrative lymphocytes and parathyroid cells function were analyzed after transplantation respectively.Results The average survival time in group A,B and C was(17.3±1.6),(43.2±2.4)and (52.5±1.5)days,respectively.There was significant difference among group (P

Rongyue Wang - One of the best experts on this subject based on the ideXlab platform.

  • marangoni convection driven bubble behavior and microstructural evolution of sn 3 5ag sn 17bi 0 5cu wt pct alloy solidified on cu substrate under space Microgravity Condition
    Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2019
    Co-Authors: Zhangfu Yuan, Rongyue Wang
    Abstract:

    Marangoni convection significantly affects the solidification structure as it controls the bubble behavior and mass transfer in the melt. Sn-3.5Ag/Sn-17Bi-0.5Cu (wt pct) alloy with different surface tension gradients was fabricated and solidified on a Cu ring substrate under space Microgravity Condition (SJ-10 satellite) to study the Marangoni convection formation mechanism. The pore and element distributions in the solidified alloy and surface tension gradient in the melt were analyzed. The differences between the microstructures of alloys solidified under Microgravity and normal gravity Conditions were also investigated. The surface tension gradient induced by Bi concentration difference resulted in the formation of Marangoni convection from the right to left of the melt under the Microgravity Condition. In the left (Bi-scarce) part of the melt, Marangoni convection induced by the Cu concentration difference flowed from outside to inside. Driven by bubble-agitation convection, Cu mainly migrated from the substrate to the right part of the melt. Therefore, dendrite-like CuxSny was distributed along a gradient. Under the normal gravity Condition, significant gravity-induced convection resulted in an even distribution of Bi and Cu, which decreased the contact angle and reduced the surface tension, thus promoting nucleation of the alloy. Therefore, fine dendrite-like CuxSny with larger number density were uniformly distributed in the melt.

  • Marangoni-Convection-Driven Bubble Behavior and Microstructural Evolution of Sn-3.5Ag/Sn-17Bi-0.5Cu (Wt Pct) Alloy Solidified on Cu Substrate Under Space Microgravity Condition
    Metallurgical and Materials Transactions A, 2019
    Co-Authors: Zhangfu Yuan, Rongyue Wang
    Abstract:

    Marangoni convection significantly affects the solidification structure as it controls the bubble behavior and mass transfer in the melt. Sn-3.5Ag/Sn-17Bi-0.5Cu (wt pct) alloy with different surface tension gradients was fabricated and solidified on a Cu ring substrate under space Microgravity Condition (SJ-10 satellite) to study the Marangoni convection formation mechanism. The pore and element distributions in the solidified alloy and surface tension gradient in the melt were analyzed. The differences between the microstructures of alloys solidified under Microgravity and normal gravity Conditions were also investigated. The surface tension gradient induced by Bi concentration difference resulted in the formation of Marangoni convection from the right to left of the melt under the Microgravity Condition. In the left (Bi-scarce) part of the melt, Marangoni convection induced by the Cu concentration difference flowed from outside to inside. Driven by bubble-agitation convection, Cu mainly migrated from the substrate to the right part of the melt. Therefore, dendrite-like CuxSny was distributed along a gradient. Under the normal gravity Condition, significant gravity-induced convection resulted in an even distribution of Bi and Cu, which decreased the contact angle and reduced the surface tension, thus promoting nucleation of the alloy. Therefore, fine dendrite-like CuxSny with larger number density were uniformly distributed in the melt.

Yao Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Microgravity on flow boiling heat transfer of liquid hydrogen in transportation pipes
    International Journal of Hydrogen Energy, 2018
    Co-Authors: Yao Zheng, Jianye Chen, Huawei Chang, Hong Chen, Shuiming Shu
    Abstract:

    The flow boiling phenomenon of liquid hydrogen (LH2) during transportation in Microgravity is very different from that under terrestrial Condition. In this study, a saturated flow boiling of LH2 in a horizontal tube has been simulated under Microgravity Condition using coupled level-set and volume of fluid method. The validation of the developed model shows good agreement with the experimental data from the literature. The changes of heat fluxes and pressure drops under different gravitational accelerations were analyzed. And, the variation of heat fluxes with different wall superheat and contact angle were compared between Microgravity (10−4g) and normal gravity (1g) Condition. Also, the influence of surface tension were studied under Microgravity. The numerical results indicate that the heat flux decrease with the decrement of gravitational acceleration. And the heat transfer ratio decrease with the increment of wall superheat in the nucleate boiling regime. The heat transfer slightly reduce when considering surface tension. In addition, the changes of contact angle have a more significant impact on heat transfer under Microgravity Condition.

Shuangfeng Xue - One of the best experts on this subject based on the ideXlab platform.

  • cotransplanation of parathyroid cell cultured under simulated Microgravity Condition and allogeneic testicular sertoli cell
    Chineae Journal of Organ Transplantation, 2011
    Co-Authors: Shuangfeng Xue, Dajiang Zhao, Xiuqing Duan
    Abstract:

    Objective To observe the function and survival of parathyroid cells cultured under simulated Microgravity Condition after cotransplanation of syngeneic allogeneic testicular sertoli cells.Methods Parathyroid cells in SD rats were assigned to flask-culture or bioreactor-culture.Allogeneic testicular sertoli cells in SD rats were cultured by using routine method.The recipients of hypoparathyroidism Wistar rat models were divided into 3 groups randomly:group A,receiving parathyroid cells(cultured with routine method)transplantation only;group B,receiving parathyroid cells and allogeneic testicular sertoli cells(cultured with routine method)transplantation;group C,receiving parathyroid cells(cultured under simulated Microgravity Condition)and allogeneic testicular sertoli cells transplantation.Allograft survival,change in cell components,apoptosis of infiltrative lymphocytes and parathyroid cells function were analyzed after transplantation respectively.Results The average survival time in group A,B and C was(17.3±1.6),(43.2±2.4)and (52.5±1.5)days,respectively.There was significant difference among group (P<0.05).In group C,parathyroid cells with strong secreting function grew into scaffold materials and adhered to them.FasL-expressing testicular cells and apoptotic lymphocytes were quite evident between allograft and kidney parenchyma.Conclusion Parathyroid cell cultured under simulated Microgravity Condition enhances its survival and function after cotransplanation of allogeneic testicular sertoli cell with immune privilege. Key words: Weighlessness simulation; 3-dimension culture; Parathyroid; Sertoli cells

  • Cotransplanation of parathyroid cell cultured under simulated Microgravity Condition and allogeneic testicular sertoli cell
    Chineae Journal of Organ Transplantation, 2011
    Co-Authors: Shuangfeng Xue, Dajiang Zhao, Xiuqing Duan
    Abstract:

    Objective To observe the function and survival of parathyroid cells cultured under simulated Microgravity Condition after cotransplanation of syngeneic allogeneic testicular sertoli cells.Methods Parathyroid cells in SD rats were assigned to flask-culture or bioreactor-culture.Allogeneic testicular sertoli cells in SD rats were cultured by using routine method.The recipients of hypoparathyroidism Wistar rat models were divided into 3 groups randomly:group A,receiving parathyroid cells(cultured with routine method)transplantation only;group B,receiving parathyroid cells and allogeneic testicular sertoli cells(cultured with routine method)transplantation;group C,receiving parathyroid cells(cultured under simulated Microgravity Condition)and allogeneic testicular sertoli cells transplantation.Allograft survival,change in cell components,apoptosis of infiltrative lymphocytes and parathyroid cells function were analyzed after transplantation respectively.Results The average survival time in group A,B and C was(17.3±1.6),(43.2±2.4)and (52.5±1.5)days,respectively.There was significant difference among group (P