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Retraction statement The publishers of International Journal of Numerical Methods for Heat & Fluid Flow wish to retract the article Salimpour, M.R., Karimi Darvanjooghi, M.H., Abdollahi, A., Karimipour, A. and Goodarzi, M. (2020), “Providing a model for Csf according to pool boiling convection heat transfer of water/ferrous oxide nanofluid using sensitivity analysis”, International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 6, pp. 2867-2881. https://doi.org/10.1108/HFF-01-2019-0009 An internal investigation into a series of submissions has uncovered evidence that the peer review process was compromised. As a result of these concerns, the findings of the article cannot be relied upon. This decision has been taken in accordance with Emerald's publishing ethics and the COPE guidelines on retractions. The publishers of the journal sincerely apologize to the readers.

Retraction statement The publishers of International Journal of Numerical Methods for Heat & Fluid Flow wish to retract the article Gholamalizadeh, E., Pahlevanzadeh, F., Ghani, K., Karimipour, A., Nguyen, T.K. and Safaei, M.R. (2020), “Simulation of water/FMWCNT nanofluid forced convection in a microchannel filled with porous material under slip velocity and temperature jump boundary conditions”, International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 5, pp. 2329-2349. https://doi.org/10.1108/HFF-01-2019-0030 An internal investigation into a series of submissions has uncovered evidence that the peer review process was compromised. As a result of these concerns, the findings of the article cannot be relied upon. This decision has been taken in accordance with Emerald's publishing ethics and the COPE guidelines on retractions. The authors of this paper would like to note that they do not agree with the content of this notice.

The publishers of International Journal of Numerical Methods for Heat & Fluid Flow wish to retract the article Tian, Z., Abdollahi, A., Shariati, M., Amindoust, A., Arasteh, H., Karimipour, A., Goodarzi, M. and Bach, Q.-V. (2020), “Turbulent flows in a spiral double-pipe heat exchanger: Optimal performance conditions using an enhanced genetic algorithm”, International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 1, pp. 39-53. https://doi.org/10.1108/HFF-04-2019-0287. An internal investigation into a series of submissions has uncovered evidence that the peer review process was compromised. As a result of these concerns, the findings of the article cannot be relied upon. This decision has been taken in accordance with Emerald's publishing ethics and the COPE guidelines on retractions. The publishers of the journal sincerely apologize to the readers