Investigation of the Vertical Movement of an Isothermal Line at the   Density Maximum in H2O and D2O
  We studied the cooling of a column of water, primarily in a freezer, and analyzed the development and movement of an isothermal line at ~4 degC in H2O and ~11 degC in D2O. Our experiments show that the vertical velocity of the symmetrical isothermal line moving up the column of water is inversely proportional to the diameter of the column of water. It has a measured maximum velocity of 1.4 +/- 0.1 cm/min when the column diameter is 22 mm and decreases to 0.4 +/- 0.1 cm/min when the diameter is increased to 125 mm. The measurement of the velocity becomes increasingly difficult to obtain when the column diameter is less than 22 mm because of the lack of complete development of the isothermal line. The data and discussion presented in this paper raise serious questions to the claim of new phase transitions in water made by S. Esposito, et. al. 0704.1381 
William R. Gorman, Gregory J. Parks, and James D. Brownridge